Itchy skin during pregnancy: PUPPP vs. cholestasis

By trimester

Weeks 1–13

1st trimester

True cholestasis and PUPPP itching almost always start later in pregnancy, so itching now is most likely just normal dry, stretching skin. Mention any new itching to your provider anyway, especially if it shows up on your palms and soles.

Weeks 14–27

2nd trimester

Cholestasis often begins in the late second trimester as itching with no rash that's worse at night and strongest on your palms and soles. If that pattern shows up now, ask for a same-day bile acid blood test instead of waiting for your next scheduled visit.

Weeks 28–birth

3rd trimester

Both conditions show up most in the third trimester, which is why telling them apart matters most now. A bumpy, visible rash usually means the harmless PUPPP. Itching with no rash on your palms and soles means cholestasis and same-day bile acid testing, since rising levels track with rising stillbirth risk.

What does the evidence show for itchy skin?

• Itching with no rash at all, especially on your palms and soles and worse at night, is the classic red flag for cholestasis and the reason to ask for same-day bloodwork. 1
• A bumpy, visible rash that starts on your belly, often right in your stretch marks, and stays itchy but otherwise harmless usually points to PUPPP instead of cholestasis. 2
• Because stillbirth risk rises alongside bile acid levels, many clinicians plan delivery around 37 weeks once cholestasis is confirmed by bloodwork. 3
• A simple non-fasting blood draw for bile acids is enough to start the workup, and a result of 100 micromoles per liter or higher is the threshold that speeds up monitoring and delivery planning. 4
• Ursodiol, the medication most cholestasis guidelines list as first-line for itch relief, still carries standard label language saying fetal harm cannot be fully ruled out, which is exactly why dosing stays your provider's call. 5

When should I call my provider about itchy skin?

Itching with no visible rash, worse at night, and concentrated on your palms and soles is the pattern that calls for a same-day, non-fasting bile acid blood test rather than waiting for your next scheduled visit. Bile acid levels of 100 micromoles per liter or higher carry the highest correlation with fetal death, which is why reaching that range changes how closely you and your baby are monitored and can move up the timing of delivery. Because bile acid levels can climb after itching starts, your provider may repeat the test even if an early result comes back normal while the itching continues. When in doubt, call your obstetric team the same day. Early input almost always beats waiting, and the on-call line exists exactly for this.