Cervical cancer is an abnormal growth of cancer cells that starts in the cervix. The cervix is the narrow part of the lower uterus. It is the entrance of the uterus, often referred to as the neck of the womb. Cervical cancer is the fourth most common type of cancer in women around the world. It is the fourth leading cause of death caused by cancer in women. However, the important thing to note is that cervical cancer is also one of the most preventable types of cancer and early diagnosis of the disease can improve the mortality rate amongst patients.

A dramatic reduction in cervical cancer occurrence is primarily due to the widespread use of advanced screening tests such as pap tests to detect cervical abnormalities and allow for early treatment.

Where does cervical cancer take place?

Under normal circumstances, the ectocervix is covered with flat, thin cells called squamous cells and the endocervix is made up of another kind of cells called columnar cells. The area where these cells meet is called the transformation (T) zone. The T zone is the most likely location for cervical cancer cells to develop.

Cervical Cancer Causes

A majority of cervical cancer cases occur because of a virus called human papillomavirus (HPV). HPV is a sexually transmitted virus. It can transfer through a sexual contact with an infected male partner.

There are many types of the HPV virus and not all types of HPV cause cervical cancer. Some of the HPV may cause genital warts. Some other cervical cancer risk factors include smoking, weak immune system, oral contraceptives, and multiple pregnancies.

Cervical Cancer Types

More than 90 percent of the cervical cancers are squamous cell carcinoma. The second most common type of cervical cancer is adenocarcinoma. Adenosquamous carcinomas or mixed carcinomas are some of the rare types of cervical cancer.

Cervical Cancer Symptoms

Usually, there are no early signs of cervical cancer, but several cervical cancer symptoms may appear as the tumor grows in size. Some of the common cervical cancer symptoms include the following:

• Bleeding between periods
• Bleeding during sexual intercourse
• Bleeding after menopause
• Smelly or blood-filled vaginal discharge
• Pelvic pain, back pain, and swollen legs
• Weight loss
• Fatigue 

• Overconsumption of animal protein, saturated fats, and calories
• Low dietary fibre intake
• Overconsumption of alcohol
• Excessive smoking
• Family history of colorectal cancer
• Obesity
• Physical inactivity

Colorectal cancer is the second most common cancer in the world. It can metastasize and spread to other body parts. Colorectal cancer is dangerous and can be life-threatening. But death rate from colorectal cancer has dropped in the recent years, thanks to advance screening techniques and better colorectal treatment options.

What is colon cancer?

Colorectal cancer is also known as bowel cancer, colon cancer, or rectal cancer. Colorectal cancer begins as an abnormal growth of cells in the inner lining of the colon or rectum. This abnormal growth is called a polyp.

Some types of polyps can change into cancer over the course of several years. But it does not mean that all polyps have the tendency to become cancerous. The chance of changing a polyp into colorectal cancer depends on the type of polyp that grows. 

Colorectal cancer can affect men and women equally. However, studies have proven that men might develop it at a younger age.

What causes colon cancer?

There is no definite cause of colorectal cancer, but old age and certain lifestyle factors can increase colorectal cancer risk. Some of these colorectal cancer risk factors include the following:

Types of Colorectal Cancer

A majority of colorectal cancers are adenocarcinoma. If you have been diagnosed with colorectal cancer, there are 95 percent chances that it is an adenocarcinoma. But there are some other types of colorectal cancer such as carcinoid, gastrointestinal stromal, lymphomas, and sarcomas.

Colorectal Cancer Symptoms

There are no early signs of colorectal cancer, but once it grows, the patients may experience the following colon cancer symptoms:

• Fatigue, weakness, and shortness of breath
• Change in bowel habits, including diarrhoea or constipation
• Blood in stool
• Abdominal discomforts such as cramps, bolting or pain
• Dramatic weight loss

Oral cancer, commonly referred to as mouth cancer or throat cancer, is an uncontrollable growth of cells in the oral cavity. It refers to cancer that develops in any of the parts that make up the mouth. It can include cancer of the lips, tongue, cheeks, the floor of the mouth, pharynx (throat), hard and soft palate and either of the sinuses. Mouth and oropharyngeal cancer can be life-threatening, but it could be prevented if the cancer is diagnosed early enough.

What Causes Oral Cancer?

Oral cancer is a result of a mutation in the DNA of the cells in the mouth. There are certain identified risk factors for mouth cancer that predisposes a person to oral cancer.

Some of the oral cancer risk factors include:

• Smoking: Smoking tobacco (cigarettes, cigars, and pipes) contains nitrosamines and other chemicals that are known to cause cancer. People who are exposed to passive smoking also experience a small increase in their risk of oral cancer.  
• Chewing tobacco: Use of any type of tobacco is one of the main reasons behind oral cancer. Chewing tobacco is not a safe alternative to cigarettes. It is a popular habit in parts of Asia and in some immigrant groups in Europe, North America, and Australia. The harmful substances in tobacco and betel can cause oral cancer.
• Alcohol consumption: Drinking excessive alcohol increases the risk of oral cancer. Using tobacco and alcohol both pose a much greater risk than using either of the substance alone.
• Poor diet: Lack of vitamins and minerals, such as iron or folic acid in the diet, can lead to a breakdown in the oral mucosa and this can make people more prone to oral cancer. People should eat plenty of proteins, vitamins, and minerals to decrease the risk of oral cancer. Fresh fruits and vegetables contain a lot of antioxidants, vitamins and other substances that help prevent damage to body cells.
• A family history of disease: There is a slightly higher risk of getting oral cancer in people who have a close relative who once had oral cancer.
• Human Papilloma Virus (HPV): HPV can contribute to some types of cancers, but it does not mean that people get these cancers like an infection. HPV can be passed on to another individual during a sexual contact, but for a majority of people, the virus is harmless and does not cause any trouble. Only a very small percentage of people with HPV end up developing oral cancer.
  
  

Oral Cancer Symptoms

There are some typical signs of mouth cancer that a majority of patients experience. Make sure to visit your doctor or dentist in case you experience any of the following signs of mouth cancer:

• Pain and discomfort in the mouth: Ongoing pain or discomfort from a long time in the mouth is the one of the most symptoms.
• Ulcers and sore: Bleeding ulcer or sore, which is not healing for more than two weeks can be a symptom of oral cancer.
• Unexplained bleeding: Unexplained bleeding in the mouth can be an alarming indication of oral cancer.
• Numbness and lost sensation: Numbness, loss of feeling or tenderness in any area of the mouth, or neck can be a symptom.
• White or red patches: Any abnormal looking patches in the mouth or throat could be a sign of cancer or precancerous changes. Although, a fungal infection called thrush can also be the reason for white or red patches.
• Difficulty in swallowing: You may feel difficulty in chewing and swallowing and feel like your food is sticking in your throat. Feeling difficulty in speaking or moving the jaw and tongue can be one of the most important throat cancer symptoms.
• Weight loss: Dramatic weight loss without any reason can also be a symptom.

Ovarian cancer refers to the abnormal growth of cells in the ovaries, which are an important part of the female reproductive system. Ovaries are two small glands, located on either side of the uterus. They help produce female sex hormones and store or release eggs. An ovarian tumor is it is the eighth most common type of cancer among women. It is the fifth most common cause of cancer deaths in women around the world. Ovarian cancer can be life-threatening if not diagnosed and treated on time, however, the chances of survival are great in the case of early diagnosis.

Ovarian cancer forms when normal ovarian cell growth fails, and there is an uncontrolled growth of cells. Most of the ovarian cancers arise from the lining cells (epithelium) of the ovary. The ovarian tumor can metastasize and spread to other organs of the body.

Ovarian Cancer: Causes

There is no identified and known cause of ovarian cancer. However, there are some risk factors associated with the disease. Family history (genetics) of ovarian cancer, older age, breast cancer, obesity, and endometriosis are some of the known ovarian cancer risk factors. Other than these, menstrual cycles play a major role in ovarian cancer. The high number of total lifetime ovulations, greater the risk of ovarian cancer.  That is, women who have had their periods before the age of 12 are at an increased risk of ovarian cancer.

The risk of ovarian cancer is also high in women suffering from familial melanoma, which is characterized by the presence of certain genes. These genes are inherited from parents and mostly occurs when two or more relatives suffer from the aggressive form of melanoma or skin cancer.

Signs of Ovarian Cancer

Typically, the symptoms of ovarian cancer are subtle during the early stage. However, the patients may experience signs of ovarian cancer once the cancer advances and starts to grow. The following are some of the ovarian cancer symptoms:

• Pain in the pelvis or belly

• Bloating

• Frequent and urgent urination

• Changes in bowel habits

• Nausea and fatigue

• Weight loss

• Breathlessness

• Loss of appetite

These signs of ovarian cancer can be confused with those of ovarian cyst. However, patients must know that ovarian cysts are far more common and primarily affects women during their childbearing age.

Pancreatic cancer starts from the cells and tissues of the pancreas – a crucial organ that releases enzymes for digestion. It is also responsible for the production of insulin, the crucial hormone that regulates blood sugar in humans.

The pancreas can be affected by both non-cancerous as well as cancerous tumors. The most common type of pancreatic cancer is pancreatic ductal adenocarcinoma, which starts in the cells that line the ducts responsible for the transport of enzymes from the pancreas to the outside.

Pancreatic cancer is often diagnosed at an advanced stage – when it has spread to other nearby organs and therefore, the treatment is challenging in such situations. The diagnosis mostly takes place when certain symptoms are observed.

Stomach cancer, also known as gastric cancer, is the fifth most common cancer worldwide. This disease is a result of the growth of cancerous and malignant cells in the inner lining of the stomach.

Stomach cancer does not grow overnight as this disease usually grows slowly over many years. Some pre-cancerous changes take place before true cancer actually develops. But these early changes rarely result in any symptoms and therefore, often go undetected in the early stage when it is most easy to treat it.

Gastric cancer can grow through the wall of the stomach and invade nearby organs. It can easily spread to the lymph vessels and lymph nodes. In an advanced stage, it can travel through the bloodstream and spread or metastasize to organs such as the liver, lungs, and bones. Usually, people diagnosed with stomach cancer have either experienced metastasis already or eventually develop it.

Types of Stomach Cancer

Stomach cancer should not be confused with other cancers in the abdomen or esophageal cancer. Some other cancer can also occur in the abdomen, including cancer of the large and small intestine, liver or pancreas. These cancers may have different symptoms, outlook, and options for treatment.

Some of the common types of gastric cancer include:

• Adenocarcinoma: It is the most common form of stomach cancer and about 90 to 95 percent of stomach cancers are This form of cancer develops from the cells that form the innermost lining (mucosa) of the stomach.
• Lymphoma: This is a rare form of stomach cancer and only about four percent of stomach cancers are lymphomas. These are cancers of the immune system tissue, sometimes found in the wall of the stomach.
• Gastrointestinal stromal tumor (GIST): It is a rare kind of tumor that starts in very early forms of cells in the wall of the stomach calledinterstitial cells of Cajal. GISTs can be found anywhere in the digestive tract.
• Carcinoid tumour: It is also a rare form of stomach cancer and about three percent of stomach cancers are carcinoid tumors. Carcinoid tumors start in cells of the stomach that produced hormones.

Some other types of stomach cancers include squamous and small cell carcinoma and leiomyosarcoma. These cancers are very rare.

Stomach Cancer Causes

There is no single, definite cause behind stomach cancer. However, several stomach cancer risk factors have been identified that could potentially lead to the formation to a tumor in the stomach. Some of these stomach cancer causes or risk factors include:

• Inflammation of the gut called gastritis
• Infection with common bacteria called Helicobacter pylori
• Long-lasting anaemia
• Growth in stomach called polyps
• Smoking
• Obesity
• Excessive consumption of smoked, pickled or salty foods
• A-type blood group
• Epstein-Barr virus infection
• Certain genes (family history of disease)

Stomach Cancer Symptoms

There can be several early stomach cancer symptoms. However, the signs of stomach cancer could be present because of some other underlying condition as well. Unfortunately, this is the main reason why it is difficult to make stomach cancer diagnosis at an early stage.

Some of the early stomach cancer symptoms may include:

• Heartburn
• Regular indigestion
• Slight nausea
• Loss of appetite
• Frequent burping
• Feeling bloated

But just experiencing indigestion or heartburn after a meal does not really mean that you have cancer. Although, if you experience these symptoms a lot, talk to your doctor, who can decide whether to conduct further tests or not.

As advanced gastric cancer grow, you may experience more serious signs of stomach cancer, including the following:

• Frequent stomach ache or pain in the sternum
• Frequent heartburns
• Vomiting containing blood
• Dysphagia (swallowing difficulties)
• Loss of appetite, accompanied by sudden weight loss
• Blood in stools
• Excessive fatigue
• Yellowish eyes or skin