Heat, humidity and long hours in a wet swimsuit make two very common conditions more frequent in summer: cystitis and vaginal thrush (candidiasis). Both affect the intimate area, both get worse with heat, and that is why many women confuse them.
However, they are different infections, with different causes and different treatments. Knowing how to tell them apart helps you act sooner and avoid unnecessary discomfort.
Cystitis and thrush: what sets them apart
Neither should be treated as a matter of routine, or without medical assessment, when symptoms persist, since a wrong diagnosis can prolong the discomfort or mask another problem.
What is cystitis?
Cystitis is a urinary tract infection that affects the bladder. In most cases, the bacterium responsible is Escherichia coli (E. coli), which colonises the urinary tract by travelling up from the urethra.
In summer, cases increase because heat, prolonged dampness from swimwear and lower water intake create the ideal environment for bacteria to multiply.
The most common symptoms are:
- A burning sensation when urinating.
- A constant, urgent need to urinate.
- A feeling of incomplete emptying of the bladder.
Cystitis does not usually cause fever. If fever appears together with lower back pain, this is a warning sign that requires immediate medical assessment in the emergency department, as it may indicate that the infection has reached the kidney.
What is vaginal thrush?
Vaginal thrush (candidiasis) is a fungal infection, usually caused by Candida albicans, that affects the lower genital tract: the vaginal and vulvar area. Unlike cystitis, it is not related to the bladder or the urinary system.
It is also encouraged by summer heat and humidity, particularly when a wet swimsuit is worn for hours or when synthetic underwear is used.
Its characteristic symptoms are:
- Intense vaginal itching.
- A thick, whitish, lumpy discharge.
If burning on urination occurs, it is usually mild and due to external contact, without the constant urge to urinate typical of cystitis. This difference is key to telling one infection from the other.
How to prevent cystitis and thrush in summer
A few simple measures significantly reduce the risk of both infections:
- Change out of a wet swimsuit as soon as possible. Retained moisture favours the growth of micro-organisms.
- Urinate after sexual intercourse. This is one of the measures with the strongest scientific evidence for preventing cystitis.
- Do not hold in urine. A bladder that empties regularly helps remove bacteria before they can attach to the urinary tract walls.
- Avoid synthetic underwear. Breathable fabrics, such as 100% cotton, prevent heat and moisture from building up in the intimate area.
Frequently asked questions
Can both infections happen at the same time?
Yes, it is possible. Since they share risk factors such as heat and humidity, it is not unusual for them to occur in the same season, even though each requires a different treatment.
Is vaginal thrush contagious?
Candida albicans is part of the normal vaginal flora in many women and only causes symptoms when it overgrows. It is not considered a sexually transmitted infection, although in some cases it can be passed on to a partner.
Can cystitis come back frequently?
Yes. Some women experience repeated episodes of cystitis, especially in summer. If this happens, a medical assessment is recommended to rule out other causes and adjust preventive measures.
When to see a doctor
You should see a doctor if symptoms recur, if they do not improve within a couple of days, or if there is doubt about which of the two infections is present, since treatment differs in each case. If fever appears together with lower back pain, you should go to the emergency department without delay.
At CreuBlanca, the approach to these infections combines clinical assessment with the complementary tests needed to confirm the diagnosis, avoiding treatment by approximation and tailoring each course of action to the actual cause of the symptoms.