Chest pain, sudden loss of vision or speech, and severe abdominal pain require immediate medical attention — but what about more subtle red flags?It can be tough to know what to do. Here’s a list of seven signs and symptoms that merit attention.

1. Unexplained weight loss

Losing weight without trying might sound like a dream come true, but in reality it can signal a health problem. If you’re not obese and you’ve lost more than 10 percent of your body weight during the past six months — for instance, 15 pounds (7 kilograms) if you weigh 150 pounds (68 kilograms) — consult your doctor.
2. Persistent or high fever

Call your doctor if your temperature is 103 F (39.4 C) or higher or you’ve had a fever for more than three days.
3. Shortness of breadth 

Shortness of breath could signal an underlying health problem. Very strenuous exercise, extreme temperatures, massive obesity and high altitude all can cause shortness of breath. Outside of these examples, shortness of breath is likely a sign of a medical problem. If you have unexplained shortness of breath, especially if it comes on suddenly and is severe, seek emergency medical care.
4. Unexplained changes in bowel habits

What’s considered normal for bowel movements varies widely. Consult your doctor if you notice unusual or unexplained changes in what’s normal for you, such as:

* Bloody, black or tarry-colored stools

* Persistent diarrhea or constipation

* Unexplained urges to have a bowel movement

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5. Confusion or personality changes

Seek medical attention if you have sudden:

* Poor thinking skills

* Difficulty focusing, sustaining or shifting attention

* Behavior changes
6. Feeling full after eating very little

If you consistently feel full sooner than normal or after eating less than usual, get checked by your doctor. This feeling, known as early satiety, also might be accompanied by nausea, vomiting, bloating or weight loss. If so, be sure to tell your doctor about these signs and symptoms as well.
7. Flashes of light

Bright spots or flashes of light sometimes indicate a migraine. In other cases, sudden flashes of light could signal retinal detachment. Immediate medical care can help prevent permanent vision loss.

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