The human immunodeficiency virus (HIV) is a retrovirus that causes contiguous disease that inhibits the action of the immune cells. The body becomes weak to fight back any disease as the function of the vital the CD4 T cell gets decreased. It is a lifelong disease that may not cause death itself, but if the person is affected by another serious disease, it may result in death.

Bipolar disorder is a brain illness or a psychological mood swing problem which results from depression. It is a mental health condition, wherein an individual goes through frequent alterations in the levels of energy, activities such as sleeping and thinking. An individual with bipolar disorder is likely to feel overtly happy and filled with energy at times, and then again can feel highly depressed and sluggish.

A group of diseases that ultimately lead to the damage of the optic nerves in the eyes, eventually causing permanent blindness and vision loss, is termed as glaucoma. In the country, it is one of the leading causes of blindness. African Americans above the age of 40 and Hispanics above the age of 60, and people having a family history of this disease are more prone to glaucoma attacks.

Opiates or opioids are a type of painkillers and they are known to provide relief from acute pain. However, a prolonged usage of such painkillers can lead to addiction. This is termed as opioid addiction. This is often regarded as the leading cause of deaths. Opioid addiction is a deep-rooted and chronic disease that is likely to last for a long time along with causing major health, economic and social problems.

Depression, also termed as the major depressive disorder, is a condition that adversely affects a person’s mental health. While suffering from it, a person experiences tremendous despair and sadness, which can lead them to live in isolation. This disorder has effects on the thinking, functioning, and feeling processes of a human being.

Dry eyes is a common chronic issue that affects about 48% citizens aged over 18 and visit the optical specialist doctor due to lack of moisture and sufficient lubrication on the eye’s surface. What starts as trivial and constant irritation on the eye’s surface, can ultimately lead to chronic and severe inflammation as well as front surface scarring of the eyes.