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Two vitamins play a special role for bruises, which is why they are often checked as well with recurring bruises. Vitamin C is needed for the formation of collagen, which keeps the walls of the small blood vessels stable and elastic. If it is lacking over a longer time, the vessels become more fragile and bleeds arise more easily, often already with the smallest strain. Vitamin K in turn is decisive for the blood clotting, because the body needs it to form important clotting factors. A deficiency can slow the clotting, which is why blood thinners of the coumarin type such as phenprocoumon act precisely on this vitamin K metabolism. A very one-sided diet can impair this supply. Both vitamins can be well covered through a balanced diet, for example with fruit, peppers, berries and green leafy vegetables such as spinach and broccoli. A targeted intake of vitamin supplements, on the other hand, only makes sense if a deficiency has been established by a doctor. With recurring bruises, the medical practice can check whether a deficiency is present, for example via a targeted blood test. A vitamin deficiency has become rarer in industrialised countries but can certainly occur, for example, with a one-sided diet, certain bowel diseases or high alcohol consumption.
Sometimes more serious causes are behind bruises. A clotting disorder means that the blood does not clot properly, so that even small injuries lead to larger bleeding and these are harder to stop. Possible signs are then not only bruises but also small wounds that bleed for a long time. Known examples are the von Willebrand syndrome or haemophilia, which often become noticeable already at a younger age through an increased bleeding tendency. A lack of blood platelets, a thrombocytopenia, or a disturbed function of the platelets can also increase the tendency to bruises. Early signs of such a disorder are often tiny dot-shaped bleeds in the skin, so-called petechiae. A liver disease can impair the formation of clotting factors, and more rarely autoimmune diseases such as a vasculitis play a role. A kidney weakness can also disturb the function of the blood platelets and thus increase the tendency to bruises. Typical for such more serious causes is that bruises appear suddenly in clusters and without occasion, often together with further bleeding or a feeling of illness. Very large, painful bruises or those at unusual places such as the trunk should also make you attentive.
You should be especially attentive when a pronounced tiredness and weakness are added to the bruises. This combination is easily overlooked in everyday life, because at first the two complaints are not connected with each other. Tiredness alone does not cause bruises, but the combination can be a sign that something in the blood is not right, for example with an anaemia or a disorder of the blood formation in the bone marrow. In such cases the bruises and the tiredness are only two visible signs of the same cause. Both then arise because the bone marrow forms too few functional blood cells or because an increased blood loss weakens the body. A simple blood count can bring a lot of clarity here and show whether blood platelets, red blood cells or other values are abnormal. Especially when the tiredness is new, pronounced and cannot be remedied by sleep, it should be taken seriously together with the bruises. A blood count is then a simple and important first step.
The overview below shows common causes of bruises and which accompanying signs are typical in each case. It does not replace a diagnosis but helps you classify your observations and prepare the conversation at the practice. What is always important is the overall picture of frequency, size and accompanying signs.
| Possible cause | Typical accompanying signs | What can help |
|---|---|---|
| Knocks, pressure, thin skin, age | Single bruises, often on arms and legs | Observe, protect the skin |
| Blood thinners and medications | More and larger bruises since new intake | Discuss with the practice, do not stop |
| Vitamin deficiency (C, K) | Easier bleeding, fragile vessels | Balanced diet, check medically |
| Clotting disorder or platelets | Nosebleeds, bleeding gums, heavy period | Blood count and clotting values |
| Bruises with tiredness | Paleness, weakness, frequent infections | Assess blood count promptly |
When you should see a doctor
Have bruises assessed by a doctor if they appear suddenly in clusters, over large areas or entirely without occasion, if further bleeding such as frequent nosebleeds or bleeding gums or an unusually heavy period is added, or if you also feel noticeably tired, pale and weak. Tiny dot-shaped bleeds, small red or violet dots in the skin, are also a reason for assessment. If you take blood thinners and notice clearly more bruises, this should also be discussed. With risk factors such as a known liver disease, an examination within one to two days is advisable. Never stop medications on your own in the process.
With a fresh bruise, cooling helps in the first hours, for example with a cool pack wrapped in a cloth, and some rest for the area. This can limit the bleed, because the cold makes the vessels contract and so less blood escapes into the surrounding tissue. Heparin-containing ointments are often used but do not make an existing bruise disappear suddenly, they at most support the healing. Home remedies such as arnica are also popular, but they do not bring about a quick disappearance of the bruise either. More important than any ointment is to have the cause assessed by a doctor with recurring bruises without cause, instead of only treating the visible sign. As prevention, it helps to protect sensitive areas of skin from knocks and pressure, for example through suitable clothing, and to pay attention to a balanced diet with enough vitamin C and K. Regular exercise and a good fluid intake also support the skin and the connective tissue and thus contribute to more stable vessels. What remains important: with recurring bruises without cause, no ointment replaces the medical assessment of the cause. It also helps to photograph affected areas and note when and where the bruises appear, because this makes the classification easier for the practice.
Especially blood thinners such as aspirin or phenprocoumon have to be taken reliably and in the right dose. brite helps you manage your medications, be reminded of the intake and keep possible interactions in view. This way you have all the important details ready immediately at the next doctor visit.
The bottom line: bruises are mostly harmless and no reason for worry. They are part of everyday life and usually disappear on their own again within one to two weeks. But they become an important signal when they appear suddenly in clusters, without occasion or together with other complaints. Then a structured look at three things is worthwhile: your medications, above all blood thinners, your vitamin supply and your blood count. These three building blocks cover the vast majority of explainable causes and can be checked in a few steps. This way you quickly get a clear picture without becoming unnecessarily worried. This way harmless can be well distinguished from serious. So do not take the symptom lightly nor panic, but observe the overall picture and seek medical advice with warning signs. What is decisive is usually not the single bruise but how many appear, how quickly and whether further complaints are added.
Well prepared for the appointment
Set up your medications in brite for free and take a clear overview to the appointment. This helps to classify possible triggers of your bruises faster and to forget nothing important.
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This article is for general information and does not replace medical advice, diagnosis or treatment. Never stop blood-thinning or other medications on your own. With suddenly clustered, large-area bleeding or a strong feeling of illness, seek medical help promptly.
