Follicles grow in cycles (growing – resting – falling out). Therefore, not all follicles grow at the same time and they have periods of rest. During the rest period the hair may remain in the follicle for some time or it may fall out. This cycle repeats itself for the whole of your life. It takes 8-12 weeks for a hair to grow from the base of the follicle to the surface of the skin. This means that if you remove a hair, you may have to wait 8-12 weeks for it to grow again. Hairs you see growing a few days later in the same area are from different follicles.
Similar to hitting the gym too often, restricting your diet in unhealthy ways can have severe consequences for your luscious locks. If you’re majorly restricting your daily calorie intake, this will slow down your metabolism and your bodily functions, including the growing cycle of your hair. Aside from that, your hair will be thirsty for those essential nutrients that it is no longer receiving. If you really must diet, start taking biotin supplements to maintain hair growth.
your situation is very common and I assume you have had a thorough investigation ruling out any medical condition for your hair thinning. Minoxidil may restore some vellus hair but unlikely to result in significant terminal hair. As long as it is not getting worse, then a hair transplant procedure may be the answer for you to restore the feminine shape to your hairline 
One of the first signs of hair loss in women occurs at the parting; this may start to appear wider than usual, with more scalp becoming visible. Another frequently seen symptom is hair thinning at the temples, which can be especially noticeable when the hair is worn up or pushed back off the face. This does not cause a receding hairline in the same way that men often experience it, rather it causes thinning hair on one or both sides but without baldness developing.
Hi Will. I have a question regarding on my hair loss problem. Currently, I’m still on my 19 but I already have that M-shaped on my hairline which is really absurd and devastating for me. I met a doctor one month ago and he prescribed me with ketoconazole shampoo. The result is quite impressive as my hair didn’t feel itchy anymore. The thing is, the hair on my hairline is still not growing as much as the other parts of my head but the fine hair didn’t fall out. Is it going to be like that or is there anything that I should consider to make it grow back? 

Side effects and concerns: Minoxidil is safe, but it can have unpleasant side effects even apart from the alcohol-related skin irritation. Sometimes the new hair differs in color and texture from surrounding hair. Another risk is hypertrichosis — excessive hair growth in the wrong places, such as the cheeks or forehead. (This problem is more likely with the stronger 5% solution.)
If you're going through or about to enter the menopause, changes in your body may also have an effect on your hair. "Hair loss becomes more prevalent leading up to and after the menopause" reveals Anabel. That being said, "it's important to realise that our hair ages, and as we get older, hair naturally gets finer. It's a totally normal part of the ageing process."

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It’s good to know that hair loss is a hereditary thing. My husband’s father has hair that is thinning out quickly, so I imagine that my husband will have a similar problem in the future. If that’s the case, then I should probably look into some preventative treatments to help him out. After all, the last thing I want is for my husband to start balding at age 40!
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