What is a concerning symptom in pregnancy that warrants further evaluation due to the risk of complications?

Vision changes during pregnancy are concerning symptoms that warrant further evaluation, primarily due to their association with potential complications like preeclampsia or other serious conditions. Preeclampsia is characterized by high blood pressure and can lead to severe outcomes for both the mother and the baby. Changes in vision, such as blurriness, double vision, or flashes of light, may indicate increased intracranial pressure or issues with the blood supply to the optic nerve, which can be serious.

Mild headaches, although they can be bothersome, are common during pregnancy and are not necessarily indicative of complications unless they are severe or accompanied by other alarming symptoms. Nasal congestion is also common due to hormonal changes and is usually not a cause for concern. Increased appetite is generally expected during pregnancy and does not typically necessitate evaluation unless it is accompanied by other symptoms that suggest an underlying health issue. Thus, vision changes stand out as a symptom that signals the need for immediate medical attention to assess for possible serious conditions.