At a glance
Sitz baths are one of the most consistently recommended self-care measures for anal fissures. The warm water relaxes the internal sphincter muscle, increases blood flow to the area, and provides pain relief — all of which support healing.
This guide covers the practical details: how to set one up, how long, how often, and what to add (or not add) to the water.
Why sitz baths help
An anal fissure involves a tear in the anal canal lining, and the internal sphincter muscle tends to spasm around it. This spasm reduces blood flow and makes healing harder. Warm water helps by:
- Relaxing the sphincter muscle — the primary benefit
- Increasing blood flow to the area, supporting healing
- Cleansing gently without the friction of wiping
- Providing immediate pain relief, particularly after bowel movements
Setting up
What you need
- A sitz bath basin (fits over the toilet) or a bathtub with a few inches of warm water
- Warm water — comfortably warm, not hot
- A clean, soft towel for patting dry
- 10 to 15 minutes of uninterrupted time
The basin option
Sitz bath basins are inexpensive and available from pharmacies or online. They sit over the toilet bowl and allow you to soak without running a full bath. This is more convenient and uses less water.
To use: fill the basin with warm water, place it securely over the toilet, and sit down. The water should cover the hips and buttocks.
The bathtub option
Run three to four inches of warm water — enough to cover the area when you sit down. This uses more water and takes longer to set up, but some people find it more comfortable because they can stretch out.
The routine
- Fill the basin or bath with warm water
- Sit in the water for 10 to 15 minutes
- Relax — deep breathing during the soak can enhance sphincter relaxation
- Pat the area dry gently with a soft towel — never rub
- If using a prescribed topical treatment, this is an ideal time to apply it — the tissue is clean, warm, and the blood flow is increased
Timing and frequency
When to do it
- After every bowel movement — the most important time. The sphincter is typically in spasm after passing stool, and the warm water counteracts this.
- First thing in the morning — helpful if you wake with discomfort
- Before bed — many people find an evening sitz bath helps with night-time pain
How often
- During active symptoms: Two to three times daily is common
- As symptoms improve: Once daily, typically after the main bowel movement
- For maintenance: Many people continue a daily sitz bath even after the fissure improves, as a preventive measure
What to add (and what not to)
Safe additions
- Plain Epsom salt (unscented) — a small handful dissolved in the water. Some people find this adds a soothing quality. The evidence that it specifically aids healing is limited, but it is generally safe.
- Nothing at all — plain warm water is the most evidence-supported option
What to avoid
- Bubble bath or foam
- Essential oils
- Fragranced bath salts
- Soap or body wash
- Hydrogen peroxide
- Apple cider vinegar
- Any product with fragrance or chemicals
The perianal area is sensitive, especially with a fissure present. Additives create risk of irritation with minimal proven benefit.
Making it sustainable
Consistency matters more than any single session. People who find sitz baths most helpful describe making them part of a non-negotiable daily routine.
Practical tips:
- Keep the basin set up and ready to use — reducing friction helps the habit stick
- Set a timer — it is easy to lose track of time or cut it short
- Have a book, podcast, or phone to make the time pass more pleasantly
- Buy a second basin if you travel frequently — portable options exist
- Combine with other care — sitz baths fit naturally into a routine that includes fibre, hydration, and topical treatments
When sitz baths are not enough
Sitz baths are supportive care, not a standalone treatment. They help create conditions for healing but may not be sufficient on their own for chronic or severe fissures. If symptoms are not improving after several weeks of consistent sitz baths alongside dietary management, discuss additional treatment options with your clinician.