Myasthenia gravis in pregnancy: what needs planning?

By trimester

Weeks 1–13

1st trimester

Before or early in pregnancy, review disease stability, swallowing and respiratory function, and medication compatibility.

Weeks 14–27

2nd trimester

During follow-up, coordinate anesthesia and obstetric planning and ensure important medicine cautions are documented.

Weeks 28–birth

3rd trimester

Before delivery, confirm newborn observation, emergency contacts, and postpartum neurological support.

What does the evidence show for myasthenia gravis?

• Myasthenia gravis affects communication between nerves and voluntary muscles. Weakness may involve the eyes, face, swallowing, limbs, or breathing and can fluctuate. Tell the pregnancy team which symptoms are usual and whether eating, speaking, or breathing has become more difficult. 1
• A 2026 clinical review describes variable disease activity through pregnancy and increased concern for worsening after birth. It also emphasizes gaps in pregnancy evidence for newer therapies. Medicine decisions should balance disease control and drug-specific information rather than assuming all new or all older agents have the same evidence. 2
• International consensus guidance calls for multidisciplinary planning throughout pregnancy, delivery, and postpartum. It specifically cautions against magnesium sulfate in MG because it can impair neuromuscular transmission. Ensure emergency and birth teams know about MG if care for preeclampsia or another complication is needed. 3
• Babies born to people with MG should be assessed for transient myasthenic weakness even when the parent's condition is well controlled. Discuss the delivery hospital's newborn assessment and respiratory support arrangements before labor. 3
• Severe breathing difficulty, chest pain, or fainting requires urgent medical care. Reduced fetal movement and other obstetric warning signs also need assessment. A familiar MG label should not narrow the evaluation before new symptoms are checked. 4

Questions to discuss with your care team

When should I call my provider about myasthenia gravis?

New or worsening breathing difficulty, inability to speak comfortably, or rapidly increasing weakness needs urgent assessment.,Difficulty swallowing liquids or handling saliva needs prompt clinical evaluation, especially with respiratory symptoms.,Severe headache, vision changes, or reduced fetal movement also needs obstetric assessment; make the MG history explicit. Trust your read on your own body. If something feels off beyond the list above, please consult your healthcare provider rather than waiting it out.