Level 1: Causes of cold headaches in pregnant women The main cause of cold headaches in pregnant women is upper respiratory tract infection caused by cold viruses, which leads to uncomfortable symptoms such as nasal congestion, runny nose, sore throat, and headaches. In addition, changes in hormonal levels during pregnancy may also cause headaches in pregnant women. Level 2: How to relieve cold and headaches in pregnant women 1. Rest: Maintaining adequate sleep and rest can help relieve physical discomfort and reduce headaches. 2. Diet: drink more water and eat something light and easy to digest.