Viruses cause familiar infections such as the common cold, but they also cause severe illnesses. Learn more about viral infections and their symptoms.| medlineplus.gov
Vaccines protect against life-threatening diseases. Follow a recommended immunization schedule to protect yourself and others at all stages of life.| medlineplus.gov
Skin cancer is the most common cancer in the U.S. Reduce your risk by staying in the shade and wearing protective clothing, sunglasses, and sunscreen all year.| medlineplus.gov
The spleen is an organ above the stomach, under the ribs. Certain diseases may cause a spleen to swell. A damaged spleen may need removed. Read more.| medlineplus.gov
Lymphatic diseases can affect your lymph, lymph vessels, or lymph nodes. Lymphatic system problems include lymphedema and swollen glands. Learn more.| medlineplus.gov
HIV (human immunodeficiency virus) attacks the body’s immune system. There is no cure but it can be treated with medicines. To know if you have HIV, get tested.| medlineplus.gov
A mutation in a person's genes can cause a medical condition called a genetic disorder. Learn about the types and how they are detected.| medlineplus.gov
If you or someone you love has been diagnosed with cancer, learn about diagnosis, treatment, risk factors, coping and much more.| medlineplus.gov
Bone marrow diseases affect your body's ability to make healthy blood cells. Learn the different causes and possible treatments.| medlineplus.gov
Autoimmune diseases are where your immune system attacks healthy cells in your body by mistake. Learn about the symptoms, tests, and treatments.| medlineplus.gov
Asthma causes one's airways to become sore and swollen. An attack means a person's lungs are getting less air. Learn about two types of treatment.| medlineplus.gov
There are many types of bacterial infections. Learn about bacterial infections that can make you sick and how to treat them.| medlineplus.gov
An allergy is a reaction by your immune system. Substances that cause reactions include pollen and food. Find the full list of allergies and symptoms.| medlineplus.gov