Diseases : Defenition, Symptoms,Types


Diseases is a disturbance in the structure or function of the human, animal, or plant body, and especially in parts of the body that produces certain signs or symptoms or affects a certain location and is not only a direct result of physical injury (

Organisms or body parts that are diseased usually show abnormal signs or symptoms. Thus, the normal condition of an organism or body must be understood in order to recognize the characteristics of the diseases. However, the clear line between the sick and the healthy is not always visible.

The study of disease is called pathology. Pathology studies the determination of the cause (etiology) of disease, understanding of the mechanisms of disease progression (pathogenesis), structural changes associated with the disease process (morphological changes), and the functional consequences of these changes.

Identifying the cause of a diseases appropriately and correctly is needed to carry out treatment appropriately.

Humans, animals and plants are all susceptible to disease. However, what interferes with the normal functioning of one type of organism may not have an effect on another.


infection is a disorder caused by harmful organisms such as viruses, fungi, and bacteria or other parasitic organisms. Many organisms such as bacteria live in our bodies. Usually the bacteria are not harmful or even helpful. But under certain conditions, some of these organisms can become dangerous and can cause disease.

There are several types of diseases that can be transmitted from one person to another through insects or other animals. And you can get sick from eating food or water that is contaminated or exposed to organisms in the environment.

Signs and symptoms of disease vary depending on the organism causing the infection, however, usually if you are exposed to the disease, the body will feel feverish or tired. Mild infections may be resolved by resting and doing home care, while some dangerous infections may require hospitalization.

Many infectious diseases, such as measles and chickenpox, can be prevented by having vaccines. Washing your hands and body frequently can also help protect you from most infectious diseases

Types of Diseases

In the human body, the word disease is often used to refer to conditions that cause pain, dysfunction, distress, social problems, or death for those they suffer from, as well as the same problems for those who come into contact with that person.

In a broad sense, the word diseases often used for injury, disability, disorder, syndrome, infection, isolated symptoms, deviant behavior, and atypical variations of structure and function. While in other contexts and for other purposes the word disease can be considered a distinguishable category. .

Illness can strike people not only physically, but also mentally. Because contracting and living with an illness can change the affected person’s perspective on life.
Death from diseases is called death from natural causes.

There are four main types of disease classifications:

  • Infectious diseases
  • Deficiency disease
  • Hereditary diseases (including genetic diseases and non-genetic hereditary diseases), and physiological diseases.

The word disease can also be categorized in other ways, such as communicable disease and non-communicable diseases. The deadliest disease in humans are coronary artery disease (blockage of blood flow), cerebrovascular disease and lower respiratory tract infections.

In developed countries, the disease that cause the most disease overall are neuropsychiatric conditions, such as depression and anxiety.

List of Diseases

  1. Cancer