A disease is an abnormal condition affecting the body of a person. It may be caused by external factors, such as infectious disease, or it may be caused by internal dysfunctions, such as autoimmune diseases. It is usually referred to a condition that causes pain, dysfunction, distress, social problems, and/or death to the person. It includes injuries, disabilities, disorders, syndromes, infections.

A localized disease is one that affects only one part of the body, such as a foot or an eye infection. A disseminated disease spreads to other parts. And a systemic disease is a disease that affects the entire body, such as influenza or high blood pressure.

Infection refers to infectious diseases, which result from the presence of pathogenic microbial agents, including viruses, bacteria, fungi, protozoa, and multicellular parasites. Illness and sickness are used to refer specifically to the patient's personal experience of his or her disease. Disorder refers to a functional abnormality or disturbance. It can be categorized into mental disorders, physical disorders, genetic disorders, emotional and behavioral disorders, and functional disorders. Medical condition includes all diseases and disorders, and also includes injuries and normal health situations, such as pregnancy, that might affect a person's health. Morbidity refers to a diseased state, disability, or poor health due to any cause.

Different forms of diseases have surrounded our daily lives and so the human immune system is becoming weak in fighting these diseases. The fastest way to recover from disease is to stop doing the things that have caused the physical problem to develop in the first place and provide your body the nutrients that are essential for your body to restore and rebuild itself back to optimal health.

Some of the common diseases which adversely affect the human body include:

• Heart Attack
• Hypertension
• Diabetes
• Cancer
• Asthma
• HIV/AIDS

Treatment of Diseases

Medical therapies or treatments are efforts to cure a disease or other health problems. Common treatments include medications, surgery, medical devices, and home remedies.

A prevention or preventive therapy is a way to avoid injury, sickness, or disease. A treatment attempts to improve or remove a problem. Cures are a subset of treatments that reverse diseases completely or end medical problems permanently.