Ticks can spread several serious diseases besides Lyme disease. These include Powassan virus, Rocky Mountain spotted fever, babesiosis, anaplasmosis, ehrlichiosis, and more. Powassan virus is rare but can be severe, causing symptoms like fever, headache, and even brain inflammation. Rocky Mountain spotted fever is more common and can cause fever, rash, and muscle aches. If not treated early with antibiotics like doxycycline, it can be fatal. The blacklegged tick, Lone Star tick, American dog tick, and others are responsible for these diseases. Preventing tick bites by using repellents, wearing protective clothing, and checking for ticks after being outdoors is crucial.