Vaginal Yeast Infection (Candidiasis): This is the most common cause of thick white vaginal discharge. It is often accompanied by itching, redness, and irritation of the vulva and vagina. The discharge is typically cottage cheese-like in appearance.

Bacterial Vaginosis (BV): Although BV typically presents with a thin, grayish-white discharge, some cases can present with a thicker discharge. It is often accompanied by a fishy odor.
Trichomoniasis: This sexually transmitted infection can cause a thick, greenish-yellow or white discharge, along with itching, burning, and redness of the vagina and vulva.
Atrophic Vaginitis: This condition, common in postmenopausal women, can cause a thin, white or yellowish discharge due to the thinning and drying of the vaginal walls.

Cervical Cancer: Although rare, cervical cancer can cause abnormal vaginal discharge, including thick white discharge. It is crucial to not miss this diagnosis due to its severe implications.
Gonorrhea: This sexually transmitted infection can cause a thick, greenish-yellow discharge in women, although it may also present with other symptoms such as pelvic pain and fever.
Chlamydia: Similar to gonorrhea, chlamydia can cause an abnormal vaginal discharge, among other symptoms, and is a critical diagnosis not to miss due to its potential for long-term reproductive health consequences.

Desquamative Inflammatory Vaginitis (DIV): A rare condition characterized by a thick, white or yellow discharge, along with significant inflammation of the vagina.
Vaginal Tuberculosis: A rare condition in many parts of the world, vaginal tuberculosis can cause a variety of symptoms including abnormal vaginal discharge, but it is much less common than other causes.