"Further, there are complications which lead to daily discomfort such as:

persistent discomfort
superficial skin infection (from scratching)
complications of the causative condition (such as gonorrhea and candida infection)

Causes
Infection
Vaginitis is often caused by an infection or the disruption of the healthy vaginal flora. The vaginal flora consists of those organisms which generally do not cause symptoms and is dominated mainly by Lactobacillus species. Disruption of the normal flora can cause a vaginal yeast infection. Vaginal yeast infection can affect women of all ages and is very common. The yeast Candida albicans is the most common cause of vaginitis. Specific forms of vaginal inflammation include the following types:
Infectious vaginitis accounts for 90% of all cases in reproductive age women:

Candidiasis: vaginitis caused by proliferation of Candida albicans, Candida tropicalis, Candida krusei
Bacterial vaginosis: vaginitis caused by increased growth of Gardnerella (a bacterium). Aerobic vaginitisOther less common infections are caused by gonorrhea, chlamydia, Mycoplasma, herpes, Campylobacter, improper hygiene, and some parasites, notably Trichomonas vaginalis. Rare cases of amebic vaginitis have been reported, primarily in tropical, developing countries. Women who have diabetes develop infectious vaginitis more often than women who do not.Further, either a change in pH balance or introduction of foreign bacteria in the vagina can lead to infectious vaginitis. Physical factors that have been claimed to contribute to the development of infections include the following: constantly wet vulva due to tight clothing, chemicals coming in contact with the vagina via scented tampons, antibiotics, birth control pills, or a diet favoring refined sugar and yeast.
Signs and symptoms
A woman may have vaginal irritation, itching, or burning or may notice a foul-smelling or abnormal discharge that could appear green or yellow.The following signs or symptoms may indicate the presence of infection:
Irritation or itching of the genital area
inflammation (irritation, redness, and swelling caused by the presence of extra immune cells) of the labia majora, labia minora, or perineal area
vaginal discharge
foul vaginal odor
pain/irritation with sexual intercourse

Complications
Vaginal infections left untreated can lead to further complications, especially for the pregnant woman. For bacterial vaginosis, these include "premature delivery, postpartum infections, clinically apparent and subclinical pelvic inflammatory disease, [as well as] postsurgical complications (after abortion, hysterectomy, caesarian section), increased vulnerability to HIV infection and, possibly, infertility". Studies have also linked trichomoniasis with increased likelihood of acquiring HIV; theories include that "vaginitis increases the number of immune cells at the site of infection, and HIV then infects those immune cells." Other theories suggest that trichomoniasis increases the amount of HIV genital shedding, thereby increasing the risk of transmission to sexual partners. While the exact association between trichomoniasis infection and HIV genital shedding has not been consistently demonstrated, "there is good evidence that TV treatment reduces HIV genital shedding. Five studies were reported in the literature and, of these, four found a decrease in HIV genital shedding after TV treatment.