It’s a strange sensation to try and describe to someone else. You press on a spot on the bottom of your foot, or you put weight through it while walking, and it feels exactly like a bruise, with that same deep, tender ache you’d get from knocking your shin on a coffee table. Except when you look down, there’s nothing there. No discolouration, no swelling, nothing that would explain why it hurts the way it does.
It’s a more common complaint than people realise, and it usually isn’t a bruise at all. A true bruise is bleeding under the skin, and if the pain you’re feeling isn’t accompanied by any colour change, the cause is almost always something else going on beneath the surface. Here’s what’s usually behind it.
What a bruise actually is, and why it matters
A bruise happens when small blood vessels under the skin are damaged, usually from an impact, and blood leaks into the surrounding tissue. That’s what causes the colour change – the purple, blue, green, and yellow progression as the blood is gradually reabsorbed. Bruising is also usually tender to touch in a fairly diffuse way, and it fades over one to two weeks as the discolouration clears.
If you’ve got that same deep, tender, “knocked” feeling but no colour change at all, the pain isn’t coming from bleeding under the skin, it’s coming from irritation or inflammation in the structures underneath: the fat pad, the fascia, a joint, or a nerve. The sensation can be remarkably similar to a bruise because a lot of these structures are close to the surface and share similar nerve pathways, but the underlying cause is quite different, and so is the treatment.
Fat pad irritation
The ball of the foot and the heel are cushioned by a layer of fat pad tissue that absorbs shock with every step. When that fat pad becomes irritated or thinned, from a long day on hard floors, worn-out shoes with no cushioning, or simply as a natural part of ageing, since fat pads do thin over time, the bones underneath take more direct impact than they’re designed to. The result is a deep, bruise-like ache directly under the ball of the foot or heel, often worse on hard surfaces and with thin-soled shoes, and better in cushioned footwear.
This is one of the most common causes of a “bruised” feeling with no visible mark, particularly in people who spend a lot of time on their feet at work, or who have recently changed footwear to something less cushioned than they’re used to.
Plantar fasciitis and fascia irritation
The plantar fascia is the band of tissue running along the sole of the foot, and when it becomes irritated or inflamed, it can produce a deep, bruised-feeling ache through the arch or heel, particularly first thing in the morning or after periods of rest. Unlike fat pad irritation, plantar fasciitis often comes with a specific tender point that can be pressed on directly, usually just in front of the heel.
Stress reactions in the bone
This one is worth taking seriously. A stress reaction, sometimes progressing to a stress fracture if ignored, happens when a bone is subjected to repeated load faster than it can repair itself, and it produces a deep, aching, bruise-like pain that’s often worse with activity and eases with rest, at least in the early stages. Runners, people who’ve recently increased their activity levels, and people in occupations with a lot of walking or standing are more prone to this.
The tricky part is that a stress reaction frequently has no visible sign at all in its early stages. There’s often no swelling, no bruising, sometimes not even much tenderness to touch, just a deep ache that doesn’t quite make sense. If a bruised feeling has been getting worse rather than better over a couple of weeks, particularly with activity, it’s worth having it looked at rather than waiting for it to become more obvious.
Nerve irritation
Nerves that are compressed or irritated can also produce sensations that feel remarkably like a deep bruise, sometimes with an added burning or tingling quality. Morton’s neuroma, a common cause of this in the ball of the foot, often feels like a bruise or like standing on a small stone, sometimes with numbness or tingling into the toes. Tight or narrow footwear tends to make it worse, and taking the shoe off often brings quick relief.
A joint that’s under strain
Joints that are dealing with early arthritic changes, an old injury, or simply excess load can ache in a way that mimics bruising, particularly around the midfoot or the base of the big toe. This kind of ache tends to be more consistent day to day rather than tied to a specific incident, and it’s often accompanied by some stiffness, especially first thing in the morning.
When it’s worth getting checked
A bruised feeling that clears up within a few days, especially after an obvious cause like a long day in bad shoes, usually isn’t cause for concern. What’s worth a proper assessment is a bruised sensation that’s been hanging around for more than a couple of weeks, one that’s getting worse rather than better, one that’s affecting how you walk, or one that comes with any numbness, tingling, or a specific point you can press on and reliably reproduce the pain.
It’s also worth mentioning if the feeling started around the same time as a change in activity, like a new running program, a big increase in time on your feet, or new footwear, since that timing is often the clue that points straight to the cause.
Why it’s worth figuring out the actual cause
The treatment for fat pad irritation looks nothing like the treatment for a stress reaction or a trapped nerve, so “just resting it and hoping” only works some of the time, and can let the wrong issue run on for longer than it needs to. A proper assessment can usually identify which of these is going on fairly quickly, based on exactly where the sensation sits, what makes it better or worse, and how it’s behaved over time.
Feeling something that doesn’t add up?
If you’ve got a bruised feeling in your foot with nothing to show for it, it’s worth having it looked at rather than guessing. Book in with the team at Watsonia Podiatry and we’ll work out exactly what’s behind it and get you on the right track to sort it out.
