What common symptom indicates someone may be experiencing dizziness due to fainting?

Lightheadedness is a common symptom associated with dizziness due to fainting. When an individual begins to faint, often referred to as pre-syncope, they may feel as if they are about to lose consciousness. This sensation typically manifests as lightheadedness, which can be likened to a feeling of faintness or an unsteady sensation. This symptom serves as a warning sign that the brain is not receiving adequate blood flow, prompting the individual to find support or sit down to prevent an actual fainting episode.

The other symptoms listed, while they can occur in varying medical situations, are not directly linked to the experience of dizziness prior to fainting. Severe headaches can be indicative of a range of conditions but are not typically a precursor to fainting. Abdominal pain can arise from numerous gastrointestinal or systemic issues but does not correlate with the lightheadedness experienced in the context of fainting. Similarly, fatigue is often related to overall tiredness and does not specifically signal that an individual is about to faint. Thus, lightheadedness stands out as the primary symptom that indicates possible fainting in this instance.