Vulvovaginal Candidiasis: This is the most common cause of vaginal itching, often associated with a white, cottage cheese-like discharge. It's a fungal infection that can be triggered by antibiotics, hormonal changes, or diabetes.

Bacterial Vaginosis (BV): Characterized by an imbalance of the normal vaginal flora, leading to an overgrowth of bacteria. Symptoms include itching, burning, and a fishy odor.
Vaginal Atrophy: Common in postmenopausal women due to decreased estrogen levels, leading to thinning and drying of the vaginal walls, which can cause itching and discomfort.
Allergic Contact Dermatitis: An allergic reaction to soaps, douches, or other products used in the genital area, causing itching, redness, and irritation.
Trichomoniasis: A sexually transmitted infection caused by a parasite, leading to itching, burning, and a foul-smelling discharge.

Cervical Cancer: Although rare, cervical cancer can cause vaginal itching among other symptoms like abnormal vaginal bleeding. It's crucial to not miss this diagnosis due to its severe implications.
Lichen Sclerosus: A chronic skin condition that can cause itching, pain, and scarring in the genital area. If left untreated, it can increase the risk of vulvar cancer.
Vulvar Intraepithelial Neoplasia (VIN): Abnormal cell growth in the vulva that can cause itching and is a precursor to vulvar cancer.

Vulvar Vestibulitis: A condition characterized by chronic pain and itching in the vulvar vestibule, often without any visible signs of infection or inflammation.
Desquamative Inflammatory Vaginitis (DIV): A rare condition causing vaginal itching, burning, and a purulent discharge, often associated with an inflammatory response.
Eczema or Psoriasis: Although more commonly associated with skin outside the genital area, these conditions can also affect the vulva and vagina, leading to itching and discomfort.