Eating habits: If you are dieting heavily, particularly with a focus on rapid weight loss, then thinning or balding might be an unintended consequence. Growing new follicles takes energy and nutrients, so when your intake suddenly changes, the body has to redistribute these nutrients and sometimes the hair misses out. There is no real rhyme or reason to this, and it is either down to pure luck or reasons scientists have yet to establish. Either way, it is a distinct category and one worth bearing in mind.
Illness or infection: Inherently, both women and men are equally likely to suffer from scalp bacterial illness and infections. In practice, however, women are slightly more likely to have these, as they tend to have longer hair. This includes fungal, parasitic and bacterial issues, all of which can cause excess shedding. It is worth noting that the presence of these conditions is (usually) no reflection on a person’s hygiene, and can happen to anyone. These issues can usually be completely fixed with medications, but in severe cases, or ones that have been left to go on for too long, might require hair implants.
Damaged hair: Tightly tying back hair can put excessive pressure on the strands, and if done daily for years, can lead to shedding. In most cases, this only damages the hairs themselves, which will just keep regrowing good as new, but sometimes the follicles themselves get too strained and will stop growing. Once again, this can occur in both genders, but is functionally more common in women as they usually have longer strands and stylings that are more elaborate.
Pregnancy: The altered hormone levels associated with pregnancy can cause shedding after giving birth, particularly in people who have noticed that their hair actually got thicker during pregnancy. This can be compounded by the use of fertility enhancers. Needless to say, this is an issue that tends to affect only women, but it is interesting to note that men who take pregnancy hormone supplements have also been known to suffer hair loss as a result. Generally, this can be treated with post-natal medication, but sometimes your hair just will not grow back and will require other solutions.
Medication: Certain medications that alter hormone levels or circulation are known to include potential hair loss as a side effect. These include acne treatments, blood pressure and diabetes medication, steroid and other hormone treatments and several other medications. These side effects can start to occur at any point in the medication regime, but will usually happen almost immediately. If you are taking medications for any of these conditions and experiencing shedding, it is possible, but by no certain means, that the two are related. Fortunately, there are specific tests one can do in order to establish the cause.