What are varicose veins? Detailed answer

BIG ENCYCLOPEDIA FOR CHILDREN AND ADULTS
Free library / Directory / Big encyclopedia for children and adults

What are varicose veins? Detailed answer

Big encyclopedia for children and adults

Directory / Big encyclopedia. Questions for quiz and self-education

Did you know?

What are varicose veins?

Older people and those who spend a lot of time on their feet often have varicose veins. You may have noticed this in those who suffer from this disease: their veins are swollen, twisted and blue. Varicose veins are veins that have lost their elasticity, causing them to swell and look twisted. Swelling occurs due to the fact that the weakened walls of the vessels are no longer able to withstand the pressure of blood in the veins.

Think of veins as just long tubes that run from your legs to your heart. When a person stands up, the weight of the blood column in the veins presses on the walls of the vessels. And in healthy veins there are valves that do not allow the pressure of the entire mass of blood on the veins in the legs. But as soon as the vein loses its elasticity, it swells up. The walls of the vein no longer "hold". When this happens, the valves cannot fully close and function properly. As a result, the mass of blood in the vein presses on the walls, which causes it to expand even more. Since our veins dilate in one way or another when we stand up, this condition may not be noticed when it first begins.

Changes in the veins often occur over a long period of time. The first time a person may notice this is when they begin to feel heaviness or fatigue in their legs. He may have leg cramps at night. He may feel a dull ache in his legs and feet, and his ankles may swell more than usual in the evening. If this is accompanied by the appearance of swollen, twisted veins, then this is a sign that this person probably has developed varicose veins.

There are many ways to treat varicose veins. In some cases, it is necessary to hold the legs above the level of the heart for some time in order to allow the veins to empty the blood with less effort. In other cases, injections are needed to "strengthen" the veins. And in the most severe cases, it may be necessary to remove sections of the vein.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Since when did caffeine enter our food?

Black tea began to be drunk in China around 2700 BC. e. There he became the main national drink and still continues to be so. Coffee was introduced to Ethiopia around 850 AD. e. According to some reports, cocoa fruits began to be consumed in Central America in 1100-1200. BC e.

Test your knowledge! Did you know...

▪ Who was the only inhabitant of the Earth whose postal address could be made up of the names of chemical elements?

▪ In which Abrahamic religions do women have the right to receive holy orders?

▪ Which country protested the Indonesian flag?

See other articles Section Big encyclopedia. Questions for quiz and self-education.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

The threat of space debris to the Earth's magnetic field 01.05.2024

More and more often we hear about an increase in the amount of space debris surrounding our planet. However, it is not only active satellites and spacecraft that contribute to this problem, but also debris from old missions. The growing number of satellites launched by companies like SpaceX creates not only opportunities for the development of the Internet, but also serious threats to space security. Experts are now turning their attention to the potential implications for the Earth's magnetic field. Dr. Jonathan McDowell of the Harvard-Smithsonian Center for Astrophysics emphasizes that companies are rapidly deploying satellite constellations, and the number of satellites could grow to 100 in the next decade. The rapid development of these cosmic armadas of satellites can lead to contamination of the Earth's plasma environment with dangerous debris and a threat to the stability of the magnetosphere. Metal debris from used rockets can disrupt the ionosphere and magnetosphere. Both of these systems play a key role in protecting the atmosphere and maintaining ... >>

Solidification of bulk substances 30.04.2024

There are quite a few mysteries in the world of science, and one of them is the strange behavior of bulk materials. They may behave like a solid but suddenly turn into a flowing liquid. This phenomenon has attracted the attention of many researchers, and we may finally be getting closer to solving this mystery. Imagine sand in an hourglass. It usually flows freely, but in some cases its particles begin to get stuck, turning from a liquid to a solid. This transition has important implications for many areas, from drug production to construction. Researchers from the USA have attempted to describe this phenomenon and come closer to understanding it. In the study, the scientists conducted simulations in the laboratory using data from bags of polystyrene beads. They found that the vibrations within these sets had specific frequencies, meaning that only certain types of vibrations could travel through the material. Received ... >>

Random news from the Archive

Diving beetle skin care device 05.09.2021

An international team of scientists has invented a smart personal skincare device modeled after a male diving beetle. This tool collects and controls body fluids by sticking suction cups to the surface of the skin, paving the way for more accurate diagnosis and treatment of skin diseases such as acne, according to the press service of McGill University (Canada).

Diving beetles Hydaticus pacificus are aquatic insects that have evolved special sticky bristles with which they cling to their mates underwater. The bristles on the forelimbs of males have unique structures and sucker-like cavities, thanks to which they can securely attach themselves to wet and uneven surfaces. Scientists took inspiration from these beetles' abilities to develop a smart, real-time skin monitoring device that attaches to uneven skin surfaces.

Developers have created miniature artificial suction cups that can collect and control body fluids by sticking to the skin. They built liquid-trapping hydrogels into the cavities of the cups to control acidity (pH). The hydrogel changes color at different pH levels. By integrating machine learning techniques, they are also developing a software application that can automatically determine pH levels from the color indicated by pH-sensitive hydrogels.

The device is expected to be applied in skin care patches, medical adhesives, and disease diagnostic tools. In the future, it will be possible to determine the biomarkers of skin diseases in real time, the authors of the work hope.

Other interesting news:

▪ Water cannons for submarines

▪ Salads are healthier with fat sauce

▪ EEPROM in a new miniature package

▪ Dell Venue 7 tablet on Intel Merrifield

▪ Sugar water filter

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Indicators, sensors, detectors. Article selection

▪ article Obligations of citizens of the Russian Federation in the field of protection from emergencies. Fundamentals of safe life

▪ Why did Princess Medea of Colchis fall in love with Jason at first sight? Detailed answer

▪ article Packer. Job description

▪ article Frequency counter up to 1250 MHz. Encyclopedia of radio electronics and electrical engineering

▪ article Digital microphone for training feathered onomatopoeia. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews