So many health factors can influence your hair cycle. During your evaluation, besides asking about your general health, the hair-loss specialist should also ask you whether you have a family or personal history of a thyroid condition or anemia, two of the most common causes of hair loss next to genetics. Also, you should be asked whether you have had any recent blood tests taken within six to nine months (if you have, take a copy on your initial visit or send a copy at a later date). This will help the specialist know what other tests to suggest.
Other important health influences on your hair cycle include any recent surgery near the time the hair loss started; as anesthesia can disturb the hair cycle, as can the reason why you had the surgery in the first place. A high fever can also be a factor. A temperature greater than 101 degrees Fahrenheit (40 degrees Celsius) can cause the hair to shed.
Obviously, numerous other general health factors can be important. For example, lupus (an autoimmune disease), digestive problems, and infections may be relevant to your condition. The most important health influences are often the ones that occurred approximately four to sixteen
weeks before you noticed your hair falling out.
To try to determine the possible health factors that could have caused your hair loss, write down any illnesses that you have had, either chronic (over a period of time) or short term. Make a note of when the illnesses started, how long they lasted, and any medications that you took (or are taking) for them. Then work forward three months or so to see whether that was when your hair loss began. If you noticed that your hair began to fall out approximately three months after an illness, that illness might be one of the causes of your hair loss.