| Hello,
It could just be that your cat is starting to shed for spring/summer.
Have you seen the cat scratching or licking excessively? Have you treated for fleas?
Some cats have allergic reactions to flea bites that can cause them to scratch, bite, and lick their hair off. Their skin gets so itchy, they can't help themselves. Once this has occurred, an allergy injection is in order to stop the allergic reaction. They applying safe, effective products like Advantage should keep the fleas at by so that it doesn't happen again.
It is possible for cats to get demodectic mange. Usually, for cats to get this type of mange, there is usually some immune system depression. Cats who are ill or have supressed immune function can get demodectic mange which is easily treated with a Lime Sulpher dip.
Demodectic mange should be found by doing a skin scraping.
Ringworm is another skin culprit which is not as easy to treat and is highly contagious to both animals and humans. Usually, one can see red/scaley skin around the nose/mouth area, tips of the paws, or on the ears most commonly. They can have it on other areas as well.
Doing a fungal culture is the best way to diagnose this problem. Usually treatment is long (4 to 6 weeks) with Fulvicin which is an oral medication. Using anti-fungal shampoo to bath or Lamasil AT cream is also desirable.
Food allergies are also common in cats and can cause skin/coat problems.
The way you describe it, I'd say it sounds more like just plain ol' shedding. Try switching to a high quality diet such as Iams Hairball or Hill's Science Diet. Also, coming or shaving may make the cat feel better.
I have a long haired cat that I have shaved at least once a year (in the spring). It makes him feel like a kitten again! And it cuts down on the uncomfortable mats.
Combing with a long-tooth metal comb may be in order. Brushes only get the top coat leaving the undercoat to mat.
Hope this information helps!
Regards, | 
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