As hair transplant techniques are medical operations, there are some medical conditions that can prevent patients from having them. Any patient who intends to undergo hair transplant must disclose any chronic or acute diseases he carries to their doctor to avoid any unforeseen problems. Heart diseases and blood pressure problems can prevent a hair transplantation procedure. If the condition is responding to the blood pressure regulator or antihypertensive drugs, it is possible to have the hair transplant performed after consultation with the doctor. As such, precautions will be taken before the operation by the doctor to deal with any emergency. Although in cases where blood pressure is constantly high and is hard to control with drugs, the hair transplantation should not be done. Diabetes, especially when it is not controlled or is in an advanced stage, can sometimes cause problems for healing of wounds and prevent blood clotting. For these cases, it is not possible to get a hair transplant procedure. If diabetes in a patient responds to the treatment, and the patient is generally in a healthy and balanced condition, it is possible to complete an hair transplantation procedure after the necessary analysis by the doctor, again taking any necessary precautions before the operation to avoid any unexpected complications. Hepatitis is a type of disease that has several different types, separated by letters (A-B-C-D-E). Only Hepatitis C patients are permanently banned from undergoing hair transplantation procedures. In the case of other types of hepatitis, the patient can undergo hair transplantation after the disease is cured and after the necessary tests are completed to ensure that the blood and the body of the patient is free from the pathogen causing the disease. AIDS patients are completely banned from hair transplantation due to the weakness of the patient’s immune system, as it is possible that the technique used in surgery will cause him very serious complications by exposing the patient to a large amount of foreign pathogens, with most likely lethal results. There are various types of thyroid disorders which can cause both hair loss and loss of hair density. Hair loss caused by these thyroid disorders is usually characterized by being spread all over the body, and not just in the head. It is possible to have hair transplantation performed for people with thyroid disorders after consultation with both the doctor dealing with thyroid disorders and the doctor who will perform the hair transplantation so that the hormones will remain stable in the patient’s body, and the disorder will not repeat itself, causing hair loss again.