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A disease is a particular abnormal condition that adversely affects the structure or function of all or part of an organism and is not immediately due to any external injury. [ 1 ][ 2 ] Diseases are often known to be medical conditions that are associated with specific signs and symptoms.
A chronic condition (also known as chronic disease or chronic illness) is a health condition or disease that is persistent or otherwise long-lasting in its effects or a disease that comes with time. The term chronic is often applied when the course of the disease lasts for more than three months. Common chronic diseases include diabetes ...
A mental disorder, also referred to as a mental illness, [ 6] a mental health condition, [ 7] or a psychiatric disability, [ 2] is a behavioral or mental pattern that causes significant distress or impairment of personal functioning. [ 8] A mental disorder is also characterized by a clinically significant disturbance in an individual's ...
Health has a variety of definitions, which have been used for different purposes over time. In general, it refers to physical and emotional wellbeing, especially that associated with normal functioning of the human body, absent of disease, pain (including mental pain ), or injury . Health can be promoted by encouraging healthful activities ...
Lifestyle disease. Lifestyle diseases can be defined as the diseases linked to the manner in which a person lives their life. These diseases are non-communicable, and can be caused by lack of physical activity, unhealthy eating, alcohol, substance use disorders and smoking tobacco, which can lead to heart disease, stroke, obesity, type II ...
AIDS-defining clinical conditions (also known as AIDS-defining illnesses or AIDS-defining diseases) is the list of diseases published by the Centers for Disease Control and Prevention (CDC) that are associated with AIDS and used worldwide as a guideline for AIDS diagnosis. CDC exclusively uses the term AIDS-defining clinical conditions, but the ...
Myalgic encephalomyelitis/chronic fatigue syndrome ( ME/CFS) is a disabling chronic illness. People with ME/CFS experience profound fatigue that does not go away with rest, sleep issues and problems with memory or concentration. Further common symptoms include dizziness, nausea and pain. [ 3] The hallmark symptom is a worsening of the illness ...
Signs and symptoms. Signs (including enlarged liver and spleen) and symptoms (including headache and vomiting) of acute HIV infection. Signs and symptoms are the observed or detectable signs, and experienced symptoms of an illness, injury, or condition. Signs are objective and externally observable; symptoms are a person's reported subjective ...