What Happens If a Yeast Infection Is Left Untreated?

Yeast infections are common, uncomfortable, and usually easy to treat with over-the-counter antifungal medicines.
But what actually happens if a yeast infection is left untreated?

This article explains how symptoms may worsen, which complications can develop, and when it is important to seek medical help.

Important: This page offers general information only. Always speak to a doctor, GP, nurse, or pharmacist if you are unsure about your symptoms.

Quick Overview: What Happens Without Treatment?

1. Symptoms Often Get Worse Over Time

A mild yeast infection may start with gentle itching, but without treatment symptoms often intensify.

Symptoms that may worsen:

• Itching becomes stronger and more persistent
• Redness increases
• Soreness or burning sensations develop
• Discomfort while sitting, walking, or exercising

While yeast infections are not usually dangerous, they can become significantly more uncomfortable if ignored.

2. Skin Can Become Irritated or Damaged

Persistent scratching, inflammation, and moisture can irritate the delicate vulval skin or foreskin (in men).

Possible effects:

• Cracked skin
• Increased swelling
• Shiny or sensitive patches
• Stinging or burning when urinating

Damaged skin makes the area more prone to bacterial irritation.

3. Discomfort During Sex or Urination May Increase

Untreated yeast infections can cause inflammation that makes everyday activities uncomfortable, including:

• Sex (friction increases pain)
• Urination (burning sensation)
• Exercise (sweat, heat, and movement irritate skin)

Many people find that symptoms temporarily worsen after sex due to increased friction or natural changes in pH.

4. Secondary Irritation or Infection Can Develop

Although yeast infections themselves are not dangerous, scratched or damaged skin can allow bacteria to enter, leading to additional irritation or complications.

These may require separate treatment, so it’s important to avoid letting symptoms continue for too long without medical guidance.

5. The Infection May Keep Coming Back

If the imbalance causing the infection is not addressed, you may start to experience recurrent yeast infections.

Common triggers for recurrence:

• Hormonal changes
• Antibiotics
• Non-breathable underwear
• High sugar levels
• Stress and low immunity

If this sounds familiar, read our full guide:
Why Yeast Infections Keep Coming Back — and How to Stop Them

6. It Might Not Be a Yeast Infection at All

This is the most important reason not to ignore symptoms.
Many people assume they have a yeast infection, but studies show that a large number of “suspected thrush” cases are actually:

• Bacterial vaginosis (BV)
• Dermatitis or eczema
• STIs such as trichomoniasis
• Candida glabrata (a different yeast type needing different management)

If you treat a condition you don’t have, symptoms may continue long-term — leading to frustration and unnecessary discomfort.

7. You May Spread the Infection to a Partner

Yeast infections aren’t considered classic sexually transmitted infections, but partners can still pass yeast back and forth during sex if one person has an imbalance.

If both partners have symptoms, both may need treatment or assessment to avoid reinfection.

See our partner guide:
Yeast Infection in Men: Symptoms, Causes & Fast Treatments

8. When Can an Untreated Yeast Infection Be Serious?

For most healthy people, untreated yeast infections are uncomfortable but not dangerous.

However, complications are more likely if you have:

• Diabetes (especially uncontrolled blood sugar)
• A weakened immune system
• Severe or spreading symptoms
• Frequent infections that don’t respond to treatment

If so, a doctor may recommend a longer-term plan or tests to identify the exact cause.

9. Safe & Effective Treatments You Can Use

Most yeast infections respond well to standard antifungal treatments such as:

• Vaginal pessaries
• Antifungal creams
• Combination packs

For full treatment options, see:
Medical Yeast Infection Treatments: Creams, Pills & Options

When to See a Doctor

Contact a doctor, GP, nurse, or sexual health clinic if:

• This is your first time having symptoms
• Symptoms don’t improve with treatment
• Symptoms return frequently
• You are pregnant
• You have pain, fever, bleeding, or unusual discharge
• You have diabetes or a weakened immune system

FAQs: Untreated Yeast Infections

Will a yeast infection go away on its own?

Some very mild cases may fluctuate, but most require proper antifungal treatment for full relief.
Ignoring symptoms can prolong discomfort.

Can an untreated yeast infection get worse?

Yes — itching, soreness, and redness often increase without treatment.

Can an untreated yeast infection become dangerous?

For most people, it’s uncomfortable but not dangerous.
People with weakened immune systems or diabetes have higher risks of complications.

Is it safe to have sex with a yeast infection?

Sex can worsen irritation and may allow partners to pass yeast back and forth. It’s best to wait until symptoms settle.

What should I do if symptoms keep returning?

Recurring symptoms may require a longer-term treatment plan or testing to confirm the exact cause.
Read our recurrent infections guide for more:
Why Yeast Infections Keep Coming Back

Disclaimer: This article is for general information only and is not a substitute for professional medical advice. Speak with a qualified healthcare provider if your symptoms are concerning or persistent.