There could be many reasons why you see more strands in your comb than usual but sometimes a medical hormonal imbalance including thyroid related disorders can cause hair fall. A hormonal imbalance can result in a dip in hair-growth promoting hormones such as oestrogen and progesterone and an increase in hair loss promoting hormones such as androgen and testosterone. This in turn can send your hair to telogen phase a resting phase where your hair releases and falls out. The period can last up to seven months during which you will not notice much hair growth in the affected areas.