What is disease and define it's …

<dl> <dt>A disease is a particular abnormal condition, a disorder of a structure or function, that affects part or all of an <a href="https://en.wikipedia.org/wiki/Organism" title="Organism">organism</a>.</dt> <dt> </dt> <dt>Acquired disease </dt> <dd>disease that began at some point during one's lifetime, as opposed to disease that was already present at birth, which is <a href="https://en.wikipedia.org/wiki/Congenital_disorder" title="Congenital disorder">congenital disease</a>. "Acquired" sounds like it could mean "caught via contagion", but it simply means acquired sometime after birth. It also sounds like it could imply secondary disease, but acquired disease can be primary disease.</dd> <dt>Acute disease </dt> <dd>disease of a short-term nature (<a href="https://en.wikipedia.org/wiki/Acute_(medicine)" title="Acute (medicine)">acute</a>); the term sometimes also <a href="https://en.wikipedia.org/wiki/Connotation" title="Connotation">connotes</a> a <a href="https://en.wikipedia.org/wiki/Fulminant" title="Fulminant">fulminant</a> nature</dd> <dt>Chronic disease </dt> <dd>disease that is a long-term issue (<a href="https://en.wikipedia.org/wiki/Chronic_condition" title="Chronic condition">chronic</a>)</dd> <dt><a href="https://en.wikipedia.org/wiki/Congenital_disorder" title="Congenital disorder">Congenital disease</a> </dt> <dd>disease that is present at <a href="https://en.wikipedia.org/wiki/Birth" title="Birth">birth</a>. It is often, <a href="https://en.wikipedia.org/wiki/Genetic_disorder" title="Genetic disorder">genetic</a> and can be <a href="https://en.wikipedia.org/wiki/Heredity" title="Heredity">inherited</a>. It can also be the result of a <a href="https://en.wikipedia.org/wiki/Vertically_transmitted_infection" title="Vertically transmitted infection">vertically transmitted infection</a> from the mother such as <a href="https://en.wikipedia.org/wiki/HIV/AIDS" title="HIV/AIDS">HIV/AIDS</a>.</dd> <dt><a href="https://en.wikipedia.org/wiki/Genetic_disorder" title="Genetic disorder">Genetic disease</a> </dt> <dd>disease that is caused by genetic <a href="https://en.wikipedia.org/wiki/Mutation" title="Mutation">mutation</a>. It is often inherited, but some mutations are random and <a href="https://en.wikipedia.org/w/index.php?title=De_novo_(genetics)&action=edit&redlink=1" title="De novo (genetics) (page does not exist)">de novo</a>.</dd> <dt>Hereditary or inherited disease </dt> <dd>a type of genetic disease caused by mutation that is <a href="https://en.wikipedia.org/wiki/Heredity" title="Heredity">hereditary</a> (and can run in families)</dd> <dt>Idiopathic disease </dt> <dd>disease <a href="https://en.wikipedia.org/wiki/Idiopathy" title="Idiopathy">whose cause is unknown</a>. As medical science has advanced, many diseases whose causes were formerly complete mysteries have been somewhat explained (for example, when it was realized that <a href="https://en.wikipedia.org/wiki/Autoimmunity" title="Autoimmunity">autoimmunity</a> is the cause of some forms of <a href="https://en.wikipedia.org/wiki/Diabetes_mellitus_type_1" title="Diabetes mellitus type 1">diabetes mellitus type 1</a>, even if we do not yet understand every molecular detail involved) or even extensively explained (for example, when it was realized that <a href="https://en.wikipedia.org/wiki/Gastric_ulcer" title="Gastric ulcer">gastric ulcers</a> are often associated with <a href="https://en.wikipedia.org/wiki/Helicobacter_pylori" title="Helicobacter pylori">Helicobacter pylori</a> infection).</dd> <dt>Incurable disease </dt> <dd>disease that cannot be <a href="https://en.wikipedia.org/wiki/Cure" title="Cure">cured</a></dd> <dt>Primary disease </dt> <dd>disease that came about as a <a href="https://en.wikipedia.org/wiki/Root_cause" title="Root cause">root cause</a> of illness, as opposed to secondary disease, which is a <a href="https://en.wikipedia.org/wiki/Sequela" title="Sequela">sequela</a> of another disease</dd> <dt>Secondary disease </dt> <dd>disease that is a <a href="https://en.wikipedia.org/wiki/Sequela" title="Sequela">sequela</a> or <a href="https://en.wikipedia.org/wiki/Complication_(medicine)" title="Complication (medicine)">complication</a> of some other disease or underlying cause (<a href="https://en.wikipedia.org/wiki/Root_cause" title="Root cause">root cause</a>). <a href="https://en.wikipedia.org/wiki/Bacterial_infection" title="Bacterial infection">Bacterial infections</a> can be either primary (healthy but then bacteria arrived) or secondary to a <a href="https://en.wikipedia.org/wiki/Viral_infection" title="Viral infection">viral infection</a> or <a href="https://en.wikipedia.org/wiki/Burn" title="Burn">burn</a>, which predisposed by creating an open wound or weakened <a href="https://en.wikipedia.org/wiki/Immunity_(medical)" title="Immunity (medical)">immunity</a> (bacteria would not have gotten established otherwise).</dd> <dt>Terminal disease </dt> <dd>disease with death as an inevitable result</dd> </dl>

In Simple words disease is as name word itself suggests without ease.

Disease is an abnormal condition of a part, organ, or system of an organism resulting from various causes, such as infection, inflammation, environmental factors, or genetic defect, and characterized by an identifiable group of signs, symptoms, or both.

<font face="Arial">Types of Diseases</font>

<font face="Arial">•</font>  <font face="Arial">Acute diseases</font>

<font face="Arial">-</font>  <font face="Arial">The symptoms appear suddenly.</font>

<font face="Arial">-</font>  <font face="Arial">These diseases are short term ie the symptoms last for short period of time.</font>

<font face="Arial">-</font>  <font face="Arial">Eg. Influenza (Flu) , Common cold.</font>

<font face="Arial">• Chronic diseases</font>

<font face="Arial">-</font>  <font face="Arial">These diseases long term diseases.</font>

<font face="Arial">-</font>  <font face="Arial">Their symptoms develop gradually and are long lasting.</font>

<font face="Arial">-</font>  <font face="Arial">Eg. TB, Cancer etc</font>

<font face="Arial">• Congenital diseases</font>

<font face="Arial">-</font>  <font face="Arial">These are inborn diseases i.e. present from birth.</font>

<font face="Arial">-</font>  <font face="Arial">Most of the diseases are permanent and generally not easily curable.</font>

<font face="Arial">-</font>  <font face="Arial">They could be due to genetic abnormality or metabolic disorder.</font>

<font face="Arial">-</font>  <font face="Arial">Eg. Down syndrome, Hemophilia, colour blindness, Sickle cell anaemia etc</font>

<font face="Arial">• Acquired diseases</font>

<font face="Arial">-</font>  <font face="Arial">The diseases which a person gets in his or her life time (i.e. after birth) are called acquired diseases.</font>

<font face="Arial">-</font>  <font face="Arial">Acquired diseases are classified in to two categories</font>

<font face="Arial">1)</font>  <font face="Arial">Communicable diseases (Infectious diseases)</font>

<font face="Arial">2)</font>  <font face="Arial">Non-communicable diseases (Non-infectious diseases)</font>

<font face="Arial">1) Communicable Diseases</font>

<font face="Arial">•</font>  <font face="Arial">Communicable diseases are caused by pathogens such as virus, bacteria, protozoan, worms or fungi.</font>

<font face="Arial">•</font>  <font face="Arial">The organism causing the disease may be transmitted from an infected person to another by means of air, water, food, physical contact or insects (vectors).</font>

<font face="Arial">•</font>  <font face="Arial">Communicable diseases can be further classified on the basis of the causative agents like Bacterial diseases, Viral diseases, Helminth diseases, Fungal diseases etc.</font>

<font face="Arial">2) Non-Communicable Diseases</font>

<font face="Arial">•</font>  <font face="Arial">These are non infectious diseases ie do not spread from an infected person to other healthy person</font>

<font face="Arial">•</font>  <font face="Arial">These diseases include deficiency diseases, degenerative diseases, cancer etc.</font>