Unusual fatigue, mood changes, digestive changes and shortness of breath can all be early signs of a heart attack, according to WebMD. These signs especially might indicate a heart attack if they are unexplained or get worse over time.
These are all signs that can be mild enough to be ignored, especially in younger women, Yale News states.
If the sufferer is tired when she wakes up in the morning and the feeling worsens throughout the day, it might be the early warning sign of a heart attack, according to WebMD. Mood changes could mean the individual feels anxious for no reason, while digestive changes could manifest as frequent indigestion or heartburn.