San Francisco (KRON) This time of year tick bites can be a big problem in the Bay Area. The love of hiking across scenic trails can be frought with a hidden danger that is the size of a pin head. KRON4’s Vicki Liviakis talked to a Portola Valley woman who was bitten by a tick which turned into debilitating Lyme disease. The horse back riding champion was diagnosed with everything from MS to cancer. Her condition left her fighting for her life.