Causes. Headaches can be triggered by a variety of factors. The most common cause of headaches is prolonged tension or stress. These are called tension headaches or muscle-contraction headaches. Virtually everyone suffers from this at some time. Muscles in your scalp, neck, and face tighten and contract, causing spasms and pain.
Cat milk alternatives: If you want to give your cat milk, the safest bet is to purchase special lactose-free cat milk from your supermarket or pet store. Bear in mind that milk contains calories (water has none) so do keep it minimal. Obesity has serious health implications for cats.
Not all cats are lactose-intolerant, but if you don't know for sure then don't try to see. If your cat accidentally eats a piece of cheese or something, then you'll know for sure. But until then, you can buy Cat-sip milk or similar milk for cats at a pet store or human Lactaid (lactose-reduced or lactose-free milk).