In general, men tend to suffer more from gradual hai rloss, whereas women often experience sudden hair loss. This is because the cause of hair loss tends to be different. In men, the main reason for hair loss is male pattern baldness, and although it may feel sudden, it is actually a gradual process.
Sudden hair loss in women is actually somewhat common, and is usually caused by some form of hormonal imbalance. This hormonal imbalance in women can be caused by such things as pregnancy, menopause, poor nutrition, and numerous psycological problems such as stress and anxiety. To prevent this form of hair loss, the hormones must be go back to normal levels, which means dealing with the problems that caused it in the first place. With regards to pregnancy or menopause, there is not much you can do, and the easiest solution is to wait a short amount of time while your body sorts its hormones out.
If the problem is stress or poor nutrition, these problems must be dealt with first. Poor nutrition is an easy solution, involving a balanced diet rich in healthy foods. The first step to changing your diet would be to make sure you are eating enough foods from the four main food groups: http://www.ohsu.edu/healthyaging/caregiving/images/food_pyramid.gif. Eating disorders are a common cause of poor nutrition in women, and should be dealt with by a professional.
If you believe stress or anxiety could be the cause, try the following to reduce stress from your life: http://helpguide.org/mental/stress_management_relief_coping.htm. If you can successfully reduce the stress in your life, you should be able to stop the rapid loss of hair.
Depression is another possible cause of hair loss in women. This is a potentially serious problem, and if it has been going on for a long period of time, it should be dealt with by a professional.
If you are taking a new form of medication, it could change your hormonal balance. Sudden hair loss may be a possible side effect of the medication. This hair loss could stop once your body becomes used to the medication, or it may not happen until you finish taking the medication.
If you are experiencing any kind of unexpected hair loss, sudden or gradual, it is a good idea to see a doctor. Each individual case is unique, and your doctor will be best suited to provide you with the correct form of treatment. It could anywhere from changing your lifestyle to something more complicated such as hair restoration for women.