It's often used in medical terms to indicate:
* A disease or disorder: Like "neuropathy" (a disease of the nerves) or "osteopathy" (a system of medicine emphasizing the musculoskeletal system).
* A treatment or method of treatment: Like "homeopathy" (a system of alternative medicine) or "physiotherapy" (treatment using physical methods).
So, "-pathy" generally implies a condition, a state of being, or a treatment related to a disease or suffering.