Vulvovaginal Candidiasis: This is a common condition caused by a yeast infection, leading to vaginal itching, redness, and sometimes groin pain. The negative urinalysis helps to rule out urinary tract infections, making candidiasis a more likely cause.

Bacterial Vaginosis (BV): Although BV is more commonly associated with an abnormal vaginal discharge, it can also cause itching and discomfort in the vaginal and groin areas.
Contact Dermatitis: Irritation from soaps, douches, or other products can cause vaginal itching and groin pain, especially if the products are highly fragranced or contain allergens.
Genital Herpes: This viral infection can cause itching, pain, and sores in the genital area, including the groin.

Pelvic Inflammatory Disease (PID): Although PID often presents with more severe symptoms like pelvic pain and fever, mild cases might only have vaginal itching and groin pain. Missing PID can lead to serious complications like infertility.
Cervical Cancer: While less common, advanced cervical cancer can cause a variety of symptoms including vaginal itching and pain. Regular screening is crucial for early detection.
Sexually Transmitted Infections (STIs) like Chlamydia or Gonorrhea: These infections can cause symptoms similar to a urinary tract infection but can also present with vaginal itching and groin pain. Untreated STIs can lead to serious health issues.

Lichen Sclerosus: A rare skin condition that can cause itching, pain, and skin changes in the genital area.
Vulvar Intraepithelial Neoplasia (VIN): Abnormal cell growth on the vulva that can cause itching and pain. It's a precursor to vulvar cancer and requires prompt medical attention.
Foreign Body in the Vagina: Although more common in children, a foreign body in the vagina can cause itching, pain, and discharge in adults as well, especially if it leads to an infection.