Vaginismus is an involuntary spasm of the outer third of the vagina that interferes with sexual intercourse. It is caused by a fear of penetration and can be primary or secondary. Treatment involves breaking the pain-tension cycle through exploration of the underlying phobia, sex education, muscle relaxation exercises, and systematic desensitization using gradually larger dilators over several weeks until intercourse is possible. Drugs may help reduce anxiety but are not usually needed. Surgery is rarely required and may worsen the condition. The goal is to help women gain control of their vaginal muscles and feel comfortable with penetration.