Too much Vitamin A
Taking too high a dose of vitamin A supplements could cause hair loss, according to the American Academy of Dermatology.
The Department of Health recommends you have no more than 1.5mg a day.
One of the best ways to get the right amount of vitamin A, which is important for your immune system and boosting vision, is through diet.
Foods rich in the nutrient include cheese, eggs, oily fish, yoghurt and liver.
In the UK, around half of men experience male pattern baldness by the age of 50 years.
According to the NHS, it is hereditary and due to oversensitive hair follicles.
The newly-engaged Prince Harry is thought to be suffering from male pattern baldness.
A doctor has suggested his hair loss appears to be genetic since his brother Prince William and father Prince Charles are also balding.
A vegan diet
They may be increasingly popular, but vegetarian and vegan diets can also lead to hair loss.
This is because it can make it easier to miss out on nutrients vital to hair growth, such as iron.
“Iron deficiency is a factor in hair loss since it’s necessary for hair growth,” Dr Hilary Jones, a GP, told Express.co.uk.
“With a lot of people shunning meat – possibly due to vegan and vegetarian diets – it is possible people are missing out on the nutrient.”
High levels of stress can likewise cause hair loss.
According to the Mayo Clinic, heightened emotion can push large numbers of follicles into a resting phase which then means they fall out from combing or washing within a few months.
Certain prescribed drugs can trigger you to lose your hair.
These include blood thinners to prevent clots, and blood pressure-lowering drugs, such as beta-blockers.
Additionally, non-steroidal anti-inflammatory drugs (NSAIDs), including ibuprofen, and antidepressants can also cause your mane to thin.