Osteoarthritis is a very common inflammatory condition in cats over 12 years of age, and the latest research shows that OA is often diagnosed radiographically in younger cats as well. It is a disorder at the organ level disorder , it is chronic and progresses slowly. Biomechanical and genetic factors play a role in the development of the disease itself, while the development of inflammation is associated with disease progression and cartilage degradation. Cells inside damaged joints release pro-inflammatory cytokines that intensify and prolong the inflammatory process. The disease affects the entire joint and surrounding structures. Animals have difficulties standing up and the limp, they show signs of pain and visibly reduced joint mobility. Once a diagnosis is established through a general clinical examination, orthopedic and neurological examination, and X-ray methods, the two goals of therapy are pain relief and functional preservation. The treatment is based on multimodal therapy, the goal of which is to reduce inflammation, reduce pain in the joint, and reduce functional disability. A variety of pain relievers are available, including NSAID opioids. Also, weight management and nutritional joint support are important aspects of OA treatment. Finally, physical rehabilitation is a great way to improve mobility and keep pets active. Early diagnosis and active monitoring of the animal's condition can improve the quality for life of cats suffering from pain and reduced mobility associated with osteoarthritis.