Why we suffer from various diseases?

Answer 1

A disease is an abnormal condition of an organism that impairs function. In human beings, "disease" is often used more broadly to refer to any condition that causes discomfort, dysfunction, distress, social problems, and/or death to the person afflicted, or similar problems for those in contact with the person. In this broader sense, it sometimes includes injuries, disabilities, disorders, syndromes, infections, isolated symptoms, deviant behaviors, and atypical variations of structure and function, while in other contexts and for other purposes these may be considered distinguishable categories. This article primarily describes human diseases, one of man's greatest enemies.

While many diseases are biological processes with observable alterations of organ function or structure, others primarily involve alterations of behavior.

Classifying a condition as a disease is a social act of valuation, and may change the social status of the person with the condition (the patient). Some conditions (known as culture-bound syndromes) are only recognized as diseases within a particular culture. Sometimes the categorizaton of a condition as a disease is controversial within the culture.

''''''Causes of disease""""
Many different factors intrinsic or extrinsic to a person (or plant or animal) can cause disease. Examples of intrinsic factors are genetic defects or nutritional deficiencies. Examples of extrinsic factors are environmental Many diseases result from a combination of intrinsic and extrinsic factors. For many diseases a cause cannot be identified

There are many different factors that can cause disease. These can be broadly categorized into the following categories like social, psychological, chemical and biological. Some factors may fall into more than one category. Biochemical causes of disease can be considered as a spectrum where at one extreme disease is caused entirely by genetic factors (e.g. CAG repeats in the Huntingtin gene that causes Huntington's Disease) and at the other extreme is caused entirely by environmental factors. Environmental factors include toxic chemicals (e.g. acetaldehyde in cigarette smoke and dioxins released from the breakdown of Agent Orange) and infectious agents (e.g. smallpox virus and poliovirus). In between these extremes genes (e.g. NOD2/CARD15) and environmental factors (e.g. Gut microbiota) interact to cause disease, as seen for example in the inflammatory bowel disease Crohn's Disease

Absence of the genetic or environmental factors in this case results in disease not being manifest. Koch's postulates can be used to determine whether a disease is caused by an infectious agent.

To determine whether a disease is caused by genetic factors, researchers study the pattern inheritance of the disease in families. This provides qualitative information about the disease (how it is inherited). A classic example of this method of research is inheritance of hemophilia in the British Royal Family. More recently this research has been used to identify the Apoliprotein E (ApoE) gene as a susceptibility gene for Alzheimer's Disease, though some forms of this gene - ApoE2 - are associated with a lower susceptibility. To determine to what extent a disease is caused by genetic factors (quantitative information), twin studies are used. Monozygotic twins are genetically identical and likely share a similar environment whereas dizygotic twins are genetically similar and likely share a similar environment. Thus by comparing the incidence of disease (termed concordance rate) in monozygotic twins with the incidence of disease in dizygotic twins, the extent to which genes contribute to disease can be determined. Candidate disease genes can be identified using a number of methods. One is to look for mutants of a model organism (e.g. the organisms Mus musculus,Drosophila melanogaster, Caenhorhabditis elegans,Brachydanio rerio and Xenopus tropicalis) that have a similar phenotype to the disease being studied. Another approach is to look for segregation of genes or genetic markers (e.g. single nucleotide polymorphism or expressed sequence tag)


There are various biochemical reactions taking place inside the body of a human being. Sometimes, the enzymes which, due to one or the other reason, function improperly and hence cause various disorders in the body.

Answer 2

Because everybody is an individual.

The body is an intricate mechanism and whenever there is a mechanism there can be some form of malfunction.

These malfunctions can be caused by internal problems or they might be the result of another organism (another intricate mechanism) interacting with the body.

We are naturally more resistant to some of these problems and more susceptible to others. This is because of population diversity.

Consequently there are a variety of illnesses and diseases to which we tend to fall prey (while others remain healthy) and there are other illnesses and diseases which afflict others while we remain well.

This is why we suffer from various diseases.

Answer 3

Besides the various scientific external factors as explained above, a disturbed & stressed mind is the main cause of all deseases. To put it in a lay man's terms, when we think negatively, the metabolism in our brains sends wrong signals to our nerves and hormones and glands and whatever, they in turn churn the stomach and digestion is effected and if our digestive system is upset all else breaks loose.

So have a Peaceful Mind, Think Positive and have a Positive Attitude to life in general.

Answer 4

1st of all, WE are the reason why we suffer from it :)
Thinking of getting better life, we chop down the tree, dig the sea; go for development, factory realization, entertainment, etc;
Indeed, we earn to have better life; but not too far extend till OVER development or other choice will be parallel taking care the earth while we development :) But human are greedy :)

Anyway, diseases came from basically bacteria, virus, fungus and so on.....but recently most of it cause by induction by chemical contamination, electrical signal, Xray, etc...in which our body response to these signal causing abnormal growth (known as cancer), later causing our body to malfunction in protecting ourselves.

What is the relationship between development & diseases ? While we develop, we alter the living condition of such bacteria etc, they are unicell, easy to adapt, easy to change than us, so eventually, they change, to become more aggressive, more attacking, and even seeking for more room for them to survive just like us, but our body cannot protect as fast as them, so we get diseases.

By the way, development (we go for nanotechnology), in which electric signal, electron, atomic be one of the field that we touch, we invent, and off course, releasing it to the environment, causing food, air, water contamination; while we live base on these elements, so basically, our body try to suite it for better way (chemically and biologically alteration), then last, some part growth, and some part dont, causing internal attacking point, causing diseases.

So, lets begin to help our earth. Try not to use Air cond, turn on lights that frequent. Try not to leave computer on 24 hrs, reducing using plastic, polymer stuff. There are so much thing we can do to help ourselves for future :)

As for our health, walk instead of drive, smile instead of cry, wish instead of blame........then, help our body to recover faster than any tablet we consume :)

Cheers "_"

Answer 5

When a foreign body enters our body, it our body starts to work against it. This is our immune system and the symptoms of fighting is called symptoms of disease.If our body(immune system) fails in fight we say we are diseased.

Answer 6

guess it happens when our cells grow weak against those foreign bodies that cause the disease

Answer 7

We tamper with nature too often assuming our supremacy. That gives even microbes to strength to fight us. Environment is also imbalanced by us. So we fall sick.

Answer 8

Bacteria, viruses, inherited conditions, mutations caused by UV, environmental pollutants, etc., etc.

Answer 9

AS WE GROW OLD OUR IMMUNE SYSTEM BECOMES WEAK AND THIS IS THE TIME WHEN OUR ENEMIES I MEAN DISEASES STRIKE US

Answer 10

due to malfunctioning of some part of our bodieswhich may be due to inadequate food we take or lack of exercise.