Vulvovaginal candidiasis: This is a common condition that can cause stabbing or burning pain in the vagina, especially if the pain is accompanied by itching, redness, and a white discharge. The sudden onset of symptoms could be related to an acute infection.

Vaginal yeast infection: Similar to vulvovaginal candidiasis, a yeast infection can cause pain, itching, and discharge, which might be perceived as stabbing pain.
Urinary Tract Infection (UTI): While UTIs typically cause pain during urination, in some cases, the pain can radiate to the vaginal area, feeling like stabbing pain.
Vaginal dryness or atrophy: Especially in postmenopausal women, vaginal dryness can lead to pain during sexual intercourse or even at rest, which might be described as stabbing.
Ovarian cysts: Rupture of an ovarian cyst can cause sudden, severe pain that might be felt in the vagina or lower abdomen.

Ectopic pregnancy: Although less common, an ectopic pregnancy can cause severe, stabbing pain in the lower abdomen or vagina, especially if the pregnancy ruptures. This is a medical emergency.
Pelvic inflammatory disease (PID): PID can cause severe pain in the lower abdomen and vagina, along with other symptoms like fever and abnormal vaginal discharge. It requires prompt treatment to prevent long-term complications.
Appendicitis: While appendicitis typically causes abdominal pain, in some cases, especially if the appendix is located near the pelvic area, the pain can be felt in the vagina.

Endometriosis: This condition, where tissue similar to the lining inside the uterus grows outside of it, can cause chronic pain, including stabbing pain during menstruation or intercourse.
Vaginal foreign body: The presence of a foreign object in the vagina can cause pain, discharge, and other symptoms, including stabbing pain if the object causes irritation or infection.
Malignancies: Although rare, cancers of the vagina, cervix, or uterus can cause pain, including stabbing pain, among other symptoms like abnormal vaginal bleeding.