In clinical practice, deltoid strain is a relatively common condition, mostly caused by direct or indirect external forces. When a patient develops a deltoid strain, he or she first feels pins and needles, localized pressure pain, diffuse swelling, and subcutaneous bruising at the site of the injury. On examination, the patient’s shoulder joint abduction and supination appears significantly limited. In addition, if there is a complete rupture of the deltoid muscle, a depression can be palpated during physical examination, and an ultrasound examination of the deltoid area can be done to clearly see the extent of the deltoid strain. In the treatment, first of all, the patient should be instructed to rest in bed and the shoulder should be given immobilization. In the deltoid area, you can apply an ointment to activate blood circulation and remove blood stasis or take oral bruising medicine at the same time, such as bruising pill and bone injury spirit. Therefore, patients with deltoid strains should not dispose of themselves or massage blindly to avoid aggravating the injury.