diagram of veins and arteries in the body

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Dr. Gregory Spitz answered:

How many arteries and veins to the human body؟?

Variable

Blood_vessels
variable and too many to count
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Dr. Ted King answered:

What is unique about the pulmonary veins and pulmonary arteries when compared to other veins and arteries on the body?

They are backwards

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All arteries in the body carry oxygenated blood from the heart. After leaving the arteries, blood enters capillaries where oxygen is dropped off and carbon dioxide waste is picked up. Veins then take the carbon dioxide back to the heart. Now here is the difference. The pulm. arteries then take the blood with carbon dioxide to the lungs where oxygen is picked up and carried by the pulm. veins.
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Dr. John Landi answered:

Can your body create new veins?

Yes.

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Our bodies have the ability to create new veins and it does it all the time. In fact, people with spider and varicose veins often complain about new vein formation if veins recur following sclerotherapy or varicose vein treatment. Even people who develop clots in veins frequently have new veins grow around the clots.
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Dr. John Landi answered:

What can visible veins all over my body mean?

Probably normal.

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Veins can enlarge and shrink for many reasons most commonly levels of hydration, genetics, aging, sun exposure, temperature changes and even skin color being more prominent in fair skinned people. Most commonly what you are experiencing is a normal variation but you probably should see a vein specialist for a full venous evaluation so that they could examine you and answer all of your questions.
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What could cause spider veins all over my body?

Genetics, pregnancy.

Veins
Spider veins, or more formally known as telangiectasias, are a common part of the aging process, and can appear in multiple areas of the body, but are typically seen in the legs, face, neck and chest. The most common causes include family history or genetics, pregnancy, trauma, hormonal influences, and occupations or activities where one sits ar stands for prolonged periods.
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Dr. John Landi answered:

I suddenly have veins showing all over my body. Why?

Probably normal.

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Veins can enlarge and shrink for many reasons most commonly levels of hydration, genetics, aging, sun exposure, temperature changes and even skin color being more prominent in fair skinned people. Most commonly what you are experiencing is a normal variation but you probably should see a vein specialist for a full venous evaluation so that they could examine you and answer all of your questions.
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Dr. James E. White answered:

What could be the cause of prominent veins all over my body?

Loss of fat Cosmetic

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Many factors are related to prominent veins ...but the most common cause is loss of body fat. Most patients who present with prominent hand veins have lost weight or decreased weight. This leads to an aged appearance of the dorsum or back of the hands. The large vein appearance can be improved by laser ablation of the prominent veins, fat transfer and/or man-made filler injections.
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Dr. Gabriel Goren answered:

Feeling extreme pain inside the veins especially in both hands and whole body?

See a doctor

Extremity-upper-hand
Your pain is not of venous origin, so the best is to have your symptoms checked out by a professional who needs to see you and examine you.
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Dr. Edward Druy answered:

Is a CT scan better at detecting blood clots in the veins/lungs/body versus ultrasounds ?

Depends on site

Computed_tomography
CT is the gold standard for detecting clots in the lungs (pulmonary embolism). Ultrasound is more reliable for detecting clots in the veins of the arms or legs. Clots in the neck veins are usually seen with ultrasound, while clots in the brain usually need an MRI for diagnosis.
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Dr. David Brouwer answered:

Over last few weeks my veins seem more prominent and blue all over body. Why. I'm worried I may have a disease?

Prominent veins

Veins
It is likely not related to anything serious. Prominent veins that are not tender, red, or bulging are probably not caused by an underlying disease. Varicose veins are dilated veins, usually on the lower legs, that are due to incompetent valves within the walls of the veins and causes irregular appearance of the veins. If that's what you are seeing then try wearing compression stockings.
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