Cancer is a type of disease that has many variations. it is an extremely broad disease, consisting of more than 200 different types. It affects millions of people around the world every year. The disease occurs due to irregular cell growth in the body. Cells divide and grow uncontrollably through the process of mitosis. This creates benign or malignant tumors. Benign tumors are not dangerous, but malignant tumors are dangerous and are called “cancerous.” Malignant tumors can invade other parts of the body by traveling either through the bloodstream or the lymphatic system. It is a very dangerous disease, non-contagious and can be cured if diagnosed and treated early. Many cancers have a different mortality rate, but not all types of cancer have a high mortality rate. Symptoms and signs A symptom is a signal felt by the person with the disease, while a signal is a signal that a witness can notice. A single symptom is often not enough to accurately diagnose a disease, but it is nevertheless very important to consult a doctor if any of these symptoms are detected. Some common symptoms of cancer are: unexplained weight loss (10 pounds or more), fever, fatigue, pain, and skin changes including darker-looking skin, yellowish skin, reddened skin, excessive hair growth and itching. Scientists are close to inventing a test to find out if a person has lung cancer using a simple blood test. Recently, scientists discovered a treatment called immunotherapy. This increases the body's immune system, reducing the risk of getting extremely ill. ...... middle of paper ...... tumor. Radiation uses high-energy x-rays to eradicate dividing cells. It is performed either when the patient refuses surgery or when the cancer has spread to an area where surgery is impossible, such as the lymph nodes or trachea. Often, radiation therapy only shrinks the size of the tumor or limits its growth, but in some cases it can destroy it. Chemotherapy is a platinum-based medication that can be given either as a pill or as an intravenous infusion. or both at the same time. It is given to patients over a period of weeks or even months, depending on the severity of the cancer. This treatment destroys normal dividing cells as well as cancer cells and therefore causes harmful side effects, such as a weakened immune system. hair loss, vomiting, nausea, diarrhea and mouth sores. These effects often disappear at the end of treatment..