Early Signs of Diabetes in Your Feet: What Numbness, Tingling and Slow-Healing Cuts Are Telling You

Person checking the sole of their foot for early signs of diabetes

Ask a doctor where the early signs of diabetes show up first, and a lot of them will say the same thing: look at the feet.

The feet are the furthest point from your heart. They have the smallest blood vessels and the longest nerves. When blood sugar has been high for a while, those small vessels and long nerves are the first to suffer. So the feet often tell the story before a blood test does.

Here's what to look for, and what each sign actually means.

Pins and needles, or a "sock" feeling

This is usually the first of the early signs of diabetes to appear in the feet. A tingling that comes and goes, or a feeling like you're wearing a thin sock when you're not. Sometimes it's a burning sensation at night, worse when you lie down.

It happens because high blood sugar slowly damages the nerves in your feet. At this stage it's annoying rather than dangerous. It's also the stage where you have the most room to turn things around.

Numbness, especially in the toes

When the tingling fades into numbness, the nerves have been affected for longer. People describe stepping on a small stone and not feeling it, or not noticing that a slipper has rubbed a blister.

This is the sign that matters most. If you can't feel a small cut or a blister, you won't treat it, and in a person with high blood sugar a small untreated wound can become a serious one.

Cramps in the calves and arches

Night-time cramps that wake you up, or cramps when you walk a short distance. High blood sugar affects circulation and the balance of minerals your muscles need, so the muscles in the lower leg tighten up more easily. Many people put this down to age or not drinking enough water. If it's new and regular, it's worth getting a fasting blood sugar test.

Cuts and blisters that take weeks to heal

A scratch that would normally close in a few days stays open for two or three weeks. The skin around it looks dull. This is one of the clearest early signs of diabetes, because wound healing depends directly on blood flow and the cells that repair tissue, and both slow down when sugar is high.

Dry, cracked skin and fungal infections that keep coming back

High blood sugar affects the sweat glands, so the skin on the feet dries out and cracks, especially around the heel. Those cracks let in fungus. If you keep getting athlete's foot or thick, discoloured toenails no matter how often you treat them, your blood sugar is a likely reason.

Feet that feel cold, or look pale or shiny

Reduced circulation shows up as feet that are cold to touch even in Malaysian weather, skin that looks thin and shiny, and less hair on the toes and lower legs. These are later signs, and they mean the blood vessels have been affected, not just the nerves.

A 2-minute foot check you can do at home

  1. Sit down, take off your socks, and look at the top, bottom and between the toes of each foot. Use a mirror for the sole if you can't see it.
  2. Look for cuts, blisters, red patches, cracks, or anything you don't remember getting.
  3. Lightly brush the sole and each toe with a tissue or a cotton bud. You should feel it clearly on every spot.
  4. Touch both feet with the back of your hand. They should feel warm, and both feet should feel about the same.

Do this once a week. If anything in steps 2 to 4 is off, get a fasting blood sugar test, and show the foot to a doctor.

Why the feet are only the messenger

Everything above is a downstream effect. The feet aren't the problem. The problem is sugar sitting in your blood for years because your cells have become less responsive to insulin. Treat the feet, yes. But if you only treat the feet, the early signs of diabetes will keep coming back.

For the full list of signs beyond the feet, read 6 Early Signs of Diabetes Most Malaysians Ignore.

References

This article is for general information only and is not medical advice. Please consult your doctor before changing your diet or medication.
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