During pregnancy, it is important to consult a doctor before taking any medications, including painkillers. However, for mild headaches at 16 weeks of pregnancy, you can try natural methods to alleviate symptoms, such as:
1. Drink more water to avoid dehydration.
2. Take a warm shower or bath.
3. Perform a gentle massage of the neck and temples.
4. Air out the room and rest in silence.
5. Try a small amount of caffeine, if the doctor has allowed it.
If the headache becomes severe and does not subside, it is necessary to consult a doctor for advice and prescription of a safe pain reliever.