Dear health-conscious friends,

Brace yourself for this wek's newsletter topic! :)

You’re sitting on the toilet, scrolling through your phone, when you finally stand up — and suddenly one or both legs feel as though they’ve disappeared.

Pins and needles. Tingling. Numbness. Maybe even that strange few seconds when your foot doesn’t seem to cooperate properly.

So what exactly is happening?

And why does the toilet seem particularly good at making your legs “fall asleep”?

It’s Mostly About Your Nerves

A common explanation is that sitting on the toilet for too long puts pressure on nerves supplying your legs.

The position is surprisingly good at doing this.

When you sit on a toilet seat, your hips and knees are flexed and the relatively narrow seat places pressure around the buttocks and backs of the thighs. Depending on exactly how you sit, this can temporarily compress or stretch peripheral nerves.

Spend long enough in that position and the nerves may stop transmitting signals quite as normally as they usually do.

The result is paresthesia — the medical term for abnormal sensations such as tingling, prickling, burning or numbness.

In other words, your leg hasn’t literally “fallen asleep.”

Its nerve signalling has temporarily been disturbed.

What About Blood Circulation?

People often say that a numb leg happens because you’ve “cut off the circulation.”

There can be some alteration in local blood flow when you remain in one position, but temporary pins and needles are primarily associated with pressure on nerves rather than completely cutting off the blood supply to your leg.

That’s reassuring, because under normal circumstances the effect is short-lived.

Change position, remove the pressure, and the nerve begins functioning normally again.

That’s when things can get interesting.

Why Does It Tingle So Much When You Stand Up?

As the compressed nerve recovers, its fibres don’t necessarily return to normal simultaneously.

During this brief recovery period, abnormal electrical signals can produce the familiar explosion of:

pins and needles.

Sometimes it feels mildly pleasant.

Sometimes it feels like a thousand tiny electric shocks shooting through your foot.

Usually, within seconds or a few minutes, normal sensation returns.

Your Phone May Be Making It Worse

There is another reason this seems to happen so often nowadays.

The smartphone.

Before smartphones, most people probably didn't plan to spend 20 minutes sitting on the toilet.

Now you can answer messages, watch videos, check social media and read the news — all while remaining in exactly the same position.

What feels like five minutes can easily become considerably longer.

And numb legs aren't the only reason prolonged toilet sitting isn't ideal.

Spending long periods sitting and straining on the toilet may also increase pressure around the veins of the anus and can contribute to haemorrhoids, particularly in people already prone to them.

So when you've finished what you went there to do, your legs may appreciate it if you put the phone away and get up.

When Should Numbness Be Checked?

Occasional pins and needles after sitting awkwardly are extremely common.

But numbness deserves more attention if it:

• happens frequently without an obvious reason
• lasts for a prolonged period after changing position
• consistently affects the same area
• is accompanied by persistent pain or weakness
• occurs with significant back pain or pain shooting down the leg
• is associated with problems walking or controlling the foot

Persistent or recurrent numbness can have many causes, including nerve compression in the spine or leg, peripheral neuropathy and other neurological conditions.

And sudden numbness or weakness affecting one side of the body, particularly with facial weakness or speech difficulty, requires urgent medical assessment because these can be symptoms of a stroke.

The Bottom Line

If your legs occasionally go numb after you've spent far too long sitting on the toilet, the explanation is usually simple.

You've been sitting in a position that temporarily puts pressure on the nerves supplying your legs.

Stand up, move around and the strange tingling usually disappears quickly.

But perhaps your numb legs are also trying to tell you something else:

You've been scrolling long enough. :)

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​AskADoc Weekly: Clear medical insights without the jargon.

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Stay healthy!

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👩‍⚕️ Dr. Joanna​
​AskADoc4Advice — where medicine meets curiosity (and a little bit of weird).

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And be sure to check out Dr. Jill's and Lila Marsh's websites below for similar medical content for a healthier lifestyle!