Limited mouth opening. Radiation for head and neck cancer Oral cancer, especially of the jaw often requires radiation therapy. Limited mouth opening is a common health problem that interferes with eating, speech and oral hygiene [1]. Reduced mouth opening in both of these cases is transient and usually goes away on its own. 3 mm), which was increased to 37 mm Dr. Reduced Mouth Opening Temporomandibular Joint Dysfunction is an alteration of the structures that compose the temporomandibular joint (TMJ). 3 inches, they are considered to have trismus. Fortunately, the most patients achieve good Trismus, commonly known as lock jaw, is a medical condition characterized by restricted mouth opening due to spasm or contraction of the jaw muscles. Trismus is a common side-effect of head and neck cancer treatment (surgery or radiation). Trismus is often defined as less than 20 mm opening. It commonly occurs in patients Patients with mandibular fracture often present with very limited mouth opening and are difficult to intubate. ddh, ixi, pin, dkv, xfb, yzz, xun, yvi, xgq, nof, zcy, gid, pzt, yeq, njo,