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

1 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.

2 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.

3 Confusion or personality changes

Seek medical attention if you have sudden:
• Poor thinking skills
• Difficulty focusing, sustaining or shifting attention
• Behavior changes
These changes could be caused by many problems, including infection, poor nutrition, mental health conditions or medications.

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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
Changes in bowel habits could signal a bacterial infection — such as campylobacter or salmonella infection — or a viral or parasitic infection. Other possible causes include irritable bowel disease and colon cancer.

6 Shortness of breath

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.

7 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 don’t have a body mass index of 30 or higher (obesity) and you’ve lost more than 10 pounds (4.5 kilograms), or more than 5 percent of your body weight, during the past six to 12 months consult your doctor.

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Have you ever experienced any of the symptoms above?