A vascular surgeon has issued a stark warning about the subtle leg symptoms millions brush off every day.
The vein expert revealed that just a few small indicators could be early signs of a much more serious underlying condition.
Dr Rema Malik, a Houston-based specialist who regularly shares educational content with her more than 95,000 Instagram followers, said vein disease doesn't appear overnight.
Instead, it sends quiet signals for months, sometimes years, before what she described as the 'real damage' begins to take hold.
According to her, one of the earliest clues is a heavy, tired feeling in the legs that creeps in by mid-afternoon.
It's the kind of symptom many put down to a long day or general fatigue, but she explained it can actually be a sign that blood is no longer circulating efficiently and is beginning to pool in the veins.
That sluggish circulation often goes hand in hand with swelling that doesn't fully resolve overnight.
While occasional swelling can be harmless, persistent puffiness that lingers into the next day may point to a deeper issue with the vein valves, which are designed to push blood back towards the heart.
Visible changes can follow, such as bulging or enlarged veins on the legs, which are among the more recognisable signs, but even these are frequently dismissed as cosmetic.
Dr Malik has repeatedly pushed back on that assumption, previously warning that so-called spider veins are often 'the tip of the iceberg' when it comes to underlying disease.
Medically, these surface veins are frequently linked to chronic venous insufficiency, which is a condition where damaged valves allow blood to flow backwards and collect in the lower limbs, increasing pressure within the vein walls.
Over time, that pressure can begin to affect the surrounding skin.
Dr Malik noted that darkening around the ankles is a particularly concerning sign, often indicating more advanced venous insufficiency.
What might appear as simple discolouration is, in reality, a marker that circulation has been compromised for some time.
Other symptoms can feel even more confusing when some patients report itching or a burning sensation over a vein, while others experience sudden leg cramps that wake them in the middle of the night.
These are often brushed off as dehydration, ageing or mineral deficiencies, but Dr Malik said they can be closely linked to vein dysfunction.
Perhaps most alarming is the development of a wound near the ankle that refuses to heal.
According to the surgeon, this is a red flag that circulation is now critically impaired, meaning the body is struggling to deliver oxygen and nutrients needed for repair.
'Your veins don't fail overnight,' she explained.
'They send signals for months - sometimes years - before the real damage sets in.'
Her warning builds on previous advice that leg pain, heaviness and so-called 'restless legs' should never be normalised, particularly in people in their 30s and 40s.
According to her, one of the earliest clues is a heavy, tired feeling in the legs that creeps in by mid-afternoon. It can be a sign that blood is no longer circulating efficiently and is beginning to pool in the veins.
While many are told these symptoms are simply part of getting older, Dr Malik insists they are classic indicators of venous disease.
She has also cautioned against relying on quick fixes, from supplements to topical creams, noting that while compression socks can help manage discomfort, they do not correct the underlying mechanical problem of faulty vein valves.
Without proper investigation, often involving an ultrasound to assess blood flow, treating only the visible symptoms can allow more serious disease to progress unnoticed.
'My dad has those veins and I have the cramps and often wake up with numbness,' one worried member of public wrote.
'Oh no, I thought compression socks fixed everything!' another commented.
'Okay, I think off the back of this I have about three of those symptoms. Thank you for bringing this up,' a third posted.
The message is to pay attention early because when vein disease is caught sooner, treatment is typically far more straightforward and in many cases more likely to be covered by insurance.