Here is a clear explanation of why a yeast infection happens:
The Root Cause: An Imbalance in Your Vagina
The vagina naturally contains a small amount of Candida (yeast/fungus) all the time - this is completely normal. It also contains good bacteria (mainly Lactobacillus) that keep the yeast under control and maintain the vagina slightly acidic (low pH).
A yeast infection happens when something disturbs this natural balance, causing the yeast to overgrow.
Common Triggers That Cause the Imbalance
1. Antibiotics
This is the most common cause. Antibiotics kill the good bacteria in your vagina along with the bad bacteria they were meant to target. Without the good bacteria to keep yeast in check, the yeast multiplies rapidly.
2. Hormonal Changes
- Pregnancy - higher estrogen levels encourage yeast growth
- Birth control pills - estrogen in the pill also promotes yeast
- Menstrual cycle - hormones fluctuate around your period, which is why symptoms sometimes come and go (as you described - "not always, sometimes")
3. High Blood Sugar / Diabetes
Yeast feeds on sugar. When blood sugar is high, more sugar reaches vaginal secretions, giving yeast more food to grow. Uncontrolled diabetes is a strong trigger.
4. Weakened Immune System
- Stress
- Illness
- HIV/AIDS
- Certain medications like steroids
5. Tight or Synthetic Clothing
Wearing tight, non-breathable underwear or pants traps moisture and warmth - the perfect environment for yeast to grow.
6. Soaps, Scented Products, and Douching
Using scented soaps, feminine sprays, or washing inside the vagina (douching) kills the natural good bacteria and changes the vaginal pH.
7. Diet High in Sugar / Refined Carbs
Eating a lot of sugar can indirectly feed yeast by raising blood glucose levels.
Why It Comes and Goes
This explains your symptom of it being "sometimes" - because the trigger may be cyclical (like your menstrual hormones shifting) or situational (like after using a soap, after stress, or after antibiotics). The yeast is always there in small amounts; it only causes symptoms when it overgrows.
Simple Analogy
Think of your vagina like a garden. The good bacteria are the gardeners keeping weeds (yeast) under control. Anything that kills or weakens the gardeners - antibiotics, hormones, sugar, chemicals - lets the weeds grow out of control.
The bottom line: Your symptoms are not caused by poor hygiene. They are caused by a disruption in the natural balance inside the vagina. Seeing a doctor for a confirmed diagnosis is the right next step, especially since it keeps coming back.