
It's known that your immune system gets weaker over time as you age. To check on your immune system, you can visit the doctor occasionally. There are also simple tests you can do yourself that take only 30 seconds to check your immune system's function. These tests are:
Press hard on the base of your nails:

Use your thumb and index finger on your right hand to press the base of the nails on your left hand. Start with your thumb for 3 to 5 seconds, then repeat with the rest of your fingers. After releasing, if the blood returns within 2 seconds, it means your blood flow is good. If this test causes pain, it means something inside your body isn't right. Doctors say each finger is linked to an internal organ like:
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Thumb: If you feel pain in your thumb during this test, it means you might have a lung problem.
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Index finger: This finger is linked to the large intestine. If you feel pain, it means you have a colon problem or constipation.
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Middle: You have heart problems.
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Ring: It is strongly connected to the heart.
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Little: It signals that you have issues with the small intestine.
Hand grip:

Make a fist with one hand, and use the other to hold that fist. After 30 seconds, the inside of your hand will turn white. That's because squeezing your hand presses on the blood vessels, making it hard for blood to reach your hand. If the red color comes back inside your hand after a short time, it means you're healthy. But if it takes longer, it means you have artery stiffness.
Glute muscle squeeze:

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Lie flat on a surface, face down.
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Keep your arms straight by your side.
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Bend your knee, and hold this position for 30 seconds.
If you can do this, your body is fine. If it hurts, it means you have a problem with your glute muscle, which is one of the strongest muscles in the body.
Leg raise:

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Lie flat on a surface, face down.
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Keep your arms straight by your sides.
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Lift your legs up while keeping the rest of your body on the ground.
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Hold this position for 35 seconds.
If you do these steps and don’t feel shaking in your leg or trouble moving it, it means your body is healthy. But if you feel pain, it means you have a problem in your belly or lower spine.
Raising the upper body:

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Lie comfortably on the ground on your stomach.
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Lift your upper body and your hands a little bit up.
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Hold this position for 30 seconds.
If you pass this test without feeling bad pain, your body is fine. But if you feel pain, there is a problem with the spine.
But you have to do these tests right so you don’t get fractures or tears. These tests are quick checks you can try at home. If you feel pain anywhere when doing them, go straight to a specialist doctor.
Did you manage to do these tests? Which one couldn’t you do?