Itching in pregnancy is usually harmless. Obstetric cholestasis is different — the itch is worst on palms and soles, worse at night, and needs a specific blood test. Here's how to tell the difference.
Itching in pregnancy is extremely common and usually harmless. Obstetric cholestasis is different — it is a specific liver condition with a distinct pattern of symptoms and real implications for your pregnancy. This guide is about telling the difference, and what to do if you think you might have it.
Normal pregnancy itching happens because the skin is stretching, circulation is changing, and dry skin is common. It is usually generalised, responds to moisturiser, and tends to be mild.
The itch of obstetric cholestasis (OC), also called intrahepatic cholestasis of pregnancy (ICP), is different in character. It is typically worst on the palms of the hands and soles of the feet, though it can be anywhere. It is often significantly worse at night — sometimes severe enough to prevent sleep. It does not respond well to antihistamines or creams. There is usually no rash accompanying it (though scratch marks from itching may appear). If the itch you're experiencing matches this pattern, contact your maternity unit rather than waiting for your next appointment.
OC affects around 1 in 140 UK pregnancies (approximately 0.7%), or about 1 in 150 depending on the study. It is slightly more common in women of South Asian heritage, affecting around 1–1.5% of that group. It typically develops in the third trimester, from around 28 weeks, though it can occasionally occur earlier.
It runs in families — if your mother or sister had it, you are at higher risk. If you had it in a previous pregnancy, you are very likely to have it again (recurrence rates are high). Tell your midwife at your booking appointment if you have a family history.
OC is diagnosed through blood tests measuring bile acid levels and liver function. A bile acid test is the key one — not just LFTs (liver function tests), though those are also checked. If you have unexplained itching matching the pattern above, contact your maternity unit and ask specifically for bile acid testing. The test does not require fasting.
Itching is common enough that it can be dismissed. If you feel your symptoms are not being taken seriously, you are entitled to ask to see another midwife or doctor, or to contact your maternity unit's triage line directly. Trust your instincts. The condition is unlikely but the consequences of missing it are significant enough that testing is always appropriate when the symptom pattern matches.
Once diagnosed, your bile acid levels will be monitored regularly. The numbers guide management decisions:
Under 40 micromol/L: mild ICP. Close monitoring, usually every 1–2 weeks. Most women in this range have outcomes similar to uncomplicated pregnancy.
40–99 micromol/L: moderate ICP. More frequent monitoring. Early delivery is often discussed from around 37–38 weeks.
100+ micromol/L: severe ICP. The evidence suggests meaningfully increased risk of stillbirth at this level. Early delivery — often from 35–36 weeks — is typically recommended.
The risk of stillbirth in mild-to-moderate ICP is small and approaches normal for the general population with good monitoring. At the severe end (100+), the risk is higher — which is why early delivery is offered. Ask your team for your specific numbers so you understand the level of monitoring you need.
The itching typically stops within a few hours to a few days of delivery. Blood tests should return to normal within a few weeks. Your GP should check this at your 6-week postnatal appointment — make sure bile acid testing is included, not just LFTs.
Two things worth knowing: OC does not cause any known long-term liver damage. However, if you take the contraceptive pill after having OC, the oestrogen can trigger a recurrence of symptoms — tell your GP when you discuss contraception. And as noted: if you have a future pregnancy, tell your midwife about your history from the very first appointment so early monitoring can be arranged.