5. Your teeth are worn down

What it could be: Acid reflux

Certain foods and drinks can wear down your own teeth, but that’s not all. Reader’s Digest explains acid reflux can seriously damage your teeth — and you may not even know you have it.

Evan Dellon, M.D., tells Reader’s Digest, “I often get referrals from dentists with patients who don’t feel heartburn or other reflux symptoms, but their teeth enamel is totally worn down.”

Additional signs and symptoms of acid reflux include a sore throat that seemingly never goes away completely, wheezing, coughing and a bad taste in your mouth.

4. You have chronic pins and needles in your limbs

What it could be: Diabetes

It may seem like you’re just not getting good circulation from the way you’re sitting. But if you’re finding yourself shaking out your legs more often thanks to that uncomfortable pins-and-needles feeling, it could be diabetes.

ActiveBeat explains when the pins-and-needles feeling is related to diabetes, it’s because nerve damage has taken place.

You might also feel throbbing, sharp pains, and numbness.

If you’ve gotten to the point where diabetes is affecting your nerves, this means you’ve had the condition for quite some time, so make sure to see a doctor immediately.

3 Your nails look ridged

What it could be: Arthritis or anemia

We bet you’ll be paying more attention to your nails after this one. While many people develop ridges in their nails over time, it can actually signal that something’s going on in your body.

Medical News Today explains there are various types of anemia that can lead you to develop vertical ridges along with your nails.

In this case, you may also notice changes in nail color or texture. Rheumatoid arthritis is another condition that can alter how your nails look.

Pay particular attention if the ridges coincide with your nails being particularly rough or easily breakable.

2. You’re always cold

What it could be: Underactive thyroid

Your thyroid helps to regulate metabolism — and when it’s underactive, it comes with a wealth of symptoms aside from just weight gain.

WebMD notes you may also feel cold easily, and you may also experience hair thinning, dry skin, fatigue, or constipation.

Older women are more susceptible to slow thyroid than anyone else. If you suspect you may have hypothyroidism, talk to your doctor about your options.

You may be able to get synthetic thyroid hormones to help.

1. Your hiccups just won’t go away

What it could be: Lung or esophageal cancer

Most cases of hiccups are totally harmless — but in some cases, they signal something serious.

Cancer Research UK explains hiccups occur when your diaphragm spasms uncontrollably.

And if you have lung or esophageal cancer that’s pressing on your diaphragm, this can also induce them.

If you find you’re hiccupping way more than normal for no discernible reason, it’s worth looking into.