Causes of Vaginitis

What are the most common causes of vaginal inflammation?

Vaginal inflammations arise from a complex interplay of internal and external factors. The most common causes are bacterial or mycotic infections, a disturbed vaginal environment, and hormonal fluctuations – especially during the menopause or with hormonal contraception. Mechanical irritations, allergic reactions, or systemic diseases such as diabetes mellitus also play a role. The balance of the vaginal flora is extremely sensitive and can be disrupted by even minor disturbances, making it easier for pathogens to take hold. Recurrent colpitis is often due to a combination of several causes.

How does colpitis caused by bacteria or fungi develop?

Colpitis caused by bacteria or fungi occur when the delicate balance of the vaginal flora is disturbed. Under normal conditions, lactic acid bacteria ensure an acidic environment (pH 3.8–4.5) that suppresses pathogenic germs. If this balance is disturbed – for example by antibiotics, hormonal fluctuations, or hygiene products – pathogenic pathogens can settle and multiply. Typical bacterial pathogens are Gardnerella vaginalis, Chlamydia or Mycoplasmas, while in fungal infections usually Candida albicans is the main focus. The trigger can be introduced from outside or arise endogenously through an overgrowth of the body's own germs.

Can excessive intimate hygiene trigger vaginitis?

Excessive intimate hygiene is actually considered one of the most common preventable causes of vaginitis. Products like intimate deodorants, alkaline soaps, perfumed wash gels, or vaginal douches destroy the natural protective barrier of the vagina by reducing the lactic acid bacteria and increasing the pH level. This allows harmful germs to spread more easily. It is especially problematic when daily washing with aggressive products is combined. Frequent use of wet wipes or harsh toilet paper can also irritate the mucous membrane and promote inflammation.

What role does the pH value play in the development of colpitis?

The vaginal pH value is a central factor for vaginal health. An acidic pH value between 3.8 and 4.5 prevents the settlement of bacteria and fungi. If this value is exceeded, for example by blood, semen, soap, or hormonal changes, the lactobacilli come under pressure. As a result, an alkaline environment dominates, in which germs like Gardnerella vaginalis or Candida albicans can spread unchecked. Therefore, the pH value is not only an indicator of infections but also a key factor in prevention.

How do hormonal changes affect the vaginal flora?

Hormonal fluctuations have a direct impact on the structure and function of the vaginal mucosa. Above all, Estrogen promotes the thickness of the mucosa, increases sugar production, and supports colonization by lactobacilli. During phases of low estrogen levels – such as during menopause, breastfeeding, or use of hormone-free contraceptives – vaginal resistance decreases. The mucosa becomes thinner, drier, and more susceptible to micro-injuries. At the same time, the number of lactic acid bacteria decreases, which raises the pH and facilitates colonization by pathogenic germs.

Can medications like antibiotics cause colpitis?

Yes, especially broad-spectrum antibiotics are among the most common iatrogenic (medication-induced) triggers of colpitis. They destroy not only pathogenic bacteria but also the beneficial lactobacilli in the vaginal flora. As a result, yeasts like Candida albicans unrestricted proliferation – a so-called secondary mycotic colpitis is the consequence. Corticosteroids, chemotherapeutic agents, or immunosuppressants can also disrupt the vaginal balance by weakening local immune defense.

What role do tampons, IUDs, or diaphragms play?

Mechanical stimuli from Tampons, IUDs, or diaphragms can irritate the vaginal mucosa and cause micro-injuries that facilitate the entry of pathogens. Especially when tampons are worn too long or menstrual hygiene is neglected, a warm, moist environment forms where bacteria multiply quickly. Improper use of diaphragms can also cause local irritation. Intrauterine devices, on the other hand, alter the vaginal environment due to their permanent presence in the uterus—especially copper IUDs can promote inflammatory processes.

Is stress an underestimated risk factor for vaginal infections?

Chronic stress impairs the immune system—even at the mucosal level. Studies show that psychosocial stress is associated with a higher susceptibility to vaginal infections. The reason: stress hormones like cortisol act immunosuppressively, alter the mucosal barrier, and disrupt the bacterial balance. Women under high mental stress suffer more frequently from recurrent vaginitis, especially when hormonal imbalances, lack of sleep, or an unbalanced diet are also present. Therefore, stress management is an important—but often underestimated—component in prevention and therapy.

Can diabetes promote the development of a vaginal infection?

Women with diabetes mellitus have a significantly increased risk of vaginal infections. The reason lies in elevated blood sugar levels, which both weakens the immune system and increases sugar availability in the mucosa—ideal conditions for the growth of yeast fungi. Additionally, poorly controlled diabetes delays wound healing, which promotes local inflammation. Studies show that fungal infections like candidiasis are more frequent and persistent in diabetic women than in metabolically healthy women.

Why is colpitis more common in girls and older women?

Both Girls before puberty as well as Women after menopause are particularly susceptible to colpitis because estrogen levels are low in both life stages. This causes the vaginal mucosa to be thin, dry, and unprotected by lactobacilli. In children, the vaginal environment is neutral (pH 7), which facilitates the growth of germs from the anal area—often due to improper hygiene. In older women, hormone deficiency leads to atrophic changes that make the mucosa more vulnerable. The combination of dry mucosa, elevated pH, and reduced immune defense explains the higher incidence of colpitis in these age groups.