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Definition of Diseases :

Diseases normally refer to a condition that disturbs the normal functioning of the body. Disease is often defined as a condition with specific symptoms and signs. Diseases are classified into four types, they are- infectious diseases, deficiency diseases, genetic diseases and psychological diseases.
Infectious diseases– These diseases are caused due to viruses, bacteria, fungus and protozoa. Easy way to catch infectious disease is to coming in contact with the infected person.

Deficiency diseases– These are caused by dietary deficiency of nutrients, vitamins, minerals and proteins. Malnutrition or deficiency of vital elements can lead to serious diseases and conditions.
Genetic diseases– Disease that is present at birth, these diseases are hereditary and run in family.
Psychological diseases– it is also called as mental disorder, it is a disease of mind involving thoughts, emotions and behaviour that causes self distress.

List of common diseases in Summer :

Here are some of the most common summer diseases
Sunburn– When people are exposed to sun for long period the skin turns red, itchy and very hot. In long run this causes melanoma, a serious skin cancer.
Sunstroke– This happens, when a person is exposed to sun for a very long period. This causes rise in the body temperature, vomiting, nausea, dizziness and fatigue.

Prickly heat– it is a red rash that occurs due to a high humidity and heat. It is caused due to blockage of the sweat glands.
Dehydration– it is a condition, where body loses its fluids. This is caused due to sweating, high temperature and exercise.
Diarrhoea– it is a condition of having at least four to five loose or liquid bowel movements each day, this leads to severe dehydration.
Jaundice– it is a water borne disease caused due to contaminated food or water. It is also called Hepatitis A.
Typhoid– it is water borne disease caused due to contaminated water.
Chicken pox

Causes of different diseases :

Diseases like sun stroke, sun burn, prickly heat and dehydration are common in summer and they are caused due to high temperatures and hot wind. If these are not treated properly, they may lead to some serious health issues.
Diseases like diarrhoea, jaundice and typhoid are food and water borne diseases. Contaminated water or food leads to these diseases.
Measles and chicken pox are the diseases caused by viruses. Chicken pox is caused by varcella virus and measles is caused by paramyxo virus.