First, you will find you cat moult more when it is warm, especially in the summer. At this hair changing period, it is nothing to worry about, just annoying for you trying to clean up and comb for your cat.
Second, if your cat appears some symptoms such as ringworm, itching, redness, etc, you should take you cat to the animal hospital for microscopy to confirm then take treatment;
Third, do not feed your cat with too much salty and sweet food. It will result in too much pressure to cat’s kidney and induce moulting. For severe condition to your cat, you need take it to a vet for detailed examination.