Signs and symptoms caused by cancer will vary depending on what part of the body is affected.
Some general signs and symptoms associated with, but not specific to, cancer, include:

Fatigue

Lump or area of thickening that can be felt under the skin

Weight changes, including unintended loss or gain

Skin changes, such as yellowing, darkening or redness of the skin, sores that won't heal, or changes to existing moles

Changes in bowel or bladder habits

Persistent cough or trouble breathing

Difficulty swallowing

Hoarseness

Persistent indigestion or discomfort after eating

Persistent, unexplained muscle or joint pain

Persistent, unexplained fevers or night sweats

Unexplained bleeding or bruising

Risk Factors:
While doctors have an idea of what may increase your risk of cancer, the majority of cancers occur in people who don't have any known risk factors. Factors known to increase your risk of cancer include:

Your Age
Cancer can take decades to develop. That's why most people diagnosed with cancer are 65 or older. While it's more common in older adults, cancer isn't exclusively an adult disease — cancer can be diagnosed at any age.

Your Habits
Certain lifestyle choices are known to increase your risk of cancer. Smoking, drinking more than one drink a day for women and up to two drinks a day for men, excessive exposure to the sun or frequent blistering sunburns, being obese, and having unsafe sex can contribute to cancer.
You can change these habits to lower your risk of cancer — though some habits are easier to change than others.

Your Health conditions
Some chronic health conditions, such as ulcerative colitis, can markedly increase your risk of developing certain cancers. Talk to your doctor about your risk.

Your Environmen
The environment around you may contain harmful chemicals that can increase your risk of cancer. Even if you don't smoke, you might inhale secondhand smoke if you go where people are smoking or if you live with someone who smokes. Chemicals in your home or workplace, such as asbestos and benzene, also are associated with an increased risk of cancer.

Types of Cancer:

Breast Cancer
It is a one of the most common types of cancers in India and here are its types:
1. Invasive Ductal Carcinoma
2. Lobular Carcinoma

Prostate Cancer
This is a common type of Cancer in men. This type of Cancer usually grows slowly and may have minimal treatment than other types of cancer that are aggressive and spread quickly.

Cervical Cancer
This disease occurs in the cervix of women in the lower part of the womb that is called the uterus. In India, cervical cancer death rate increases every year.

Stomach Cancer
This type of Cancer includes all parts of the stomach and it is also called gastric cancer. There are mainly 5 parts of the stomach that are affected by this disease:
1. Fundus
2. Cardia
3. Body
4. Pylorus
5. Antrum

Lung Cancer
When abnormal cells divide in an uncontrolled way to form a tumor in the lungs. Smoking can increase your risk of developing lung Cancer.

Colorectal Cancer
It is adenocarcinomas from epithelial cells. The increasing age is the greatest risk factor in this disease as it occurs at the age of 40 year or over.

Oral Cancer
It is the most common type of disease in India which is mostly caused by the intake of tobacco and found in the tissue of the lip and the commonest site is oral cavity and cough.

Cancer Care Prevention:

Doctors have identified several ways to reduce your risk of cancer, such as:

Stop Smoking:
If you smoke, quit. If you don't smoke, don't start. Smoking is linked to several types of cancer — not just lung cancer. Stopping now will reduce your risk of cancer in the future.

Avoid excessive sun exposure:

Harmful ultraviolet (UV) rays from the sun can increase your risk of skin cancer. Limit your sun exposure by staying in the shade, wearing protective clothing or applying sunscreen.

Eat a healthy diet:

Choose a diet rich in fruits and vegetables. Select whole grains and lean proteins. Limit your intake of processed meats.

Exercise most days of the week:

Regular exercise is linked to a lower risk of cancer. Aim for at least 30 minutes of exercise most days of the week. If you haven't been exercising regularly, start out slowly and work your way up to 30 minutes or longer.

Maintain a healthy weight:

Being overweight or obese may increase your risk of cancer. Work to achieve and maintain a healthy weight through a combination of a healthy diet and regular exercise.

Drink alcohol in moderation, if you choose to drink:

If you choose to drink alcohol, do so in moderation. For healthy adults, that means up to one drink a day for women and up to two drinks a day for men.

Schedule cancer screening exams:

Talk to your doctor about what types of cancer screening exams are best for you based on your risk factors.

Ask your doctor about immunizations:

Certain viruses increase your risk of cancer. Immunizations may help prevent those viruses, including hepatitis B, which increases the risk of liver cancer, and human papillomavirus (HPV), which increases the risk of cervical cancer and other cancers. Ask your doctor whether immunization against these viruses is appropriate for you.