Tendon disorders encompass lesions caused by irritation and traumatic factors. Chronic irritation from occupation or repeated movements can lead to disorders such as trigger finger, trigger thumb, tenosynovitis, and De Quervain's syndrome. Traumatic accidents and sports injuries can result in tears of collateral ligaments, sagittal bands, central slip tendon, lateral band, terminal band, flexor pollicis longus, flexor digitorum superficialis, flexor digitorum profundus, and volar plate. These lesions can all be identified through ultrasound, and treatment options, including physical therapy, injections, or surgery, can be tailored to the individual patient. Ultrasound-guided injections for finger pathologies will also be discussed in this topic.