The most complicated joint, the knee is used for everything from standing up, sitting, to walking, running, etc. If you are suffering from knee pain, see a doctor or a orthopedic surgeon who can determine the cause and prescribe an appropriate treatment and pain management plan.

If you have knee pain, some common causes include:

* Arthritis
* Baker’s cyst
* Bursitis
* Connective tissue disorders such as lupus
* Dislocation of the kneecap
* Iliotibial band syndrome
* Infection in the joint
* Knee injuries
* Tendinitis
* Torn cartilage (a meniscus tear)
* Torn ligament (ACL tear)
* Strain or sprain

Does your ears pop when you’re flying on an airplane? one third of all passengers will experience this ear pain at least once.

So, Why do your ears pop in airplanes?

Rapid changes in air pressure inside the aircraft cause the air pocket inside the ear to expand during takeoff and contract during descent, stretching the eardrum. To equalize pressure, air must enter or escape through the Eustachian tube.

Some people experience ear discomfort, pain, temporary hearing loss. This condition is called aerotitus and one third of all passengers will experience this ear pain at least once.

The air pocket inside the middle ear expand during takeoff and landing and this stretches the eardrum. Air must enter and escape through the Eustachian tube in the ear to normalize the ear drum. The Eustachian tube sometimes has difficulty keeping up with the rapid changes in air pressure during takeoff and landing.

What You Can Do

• Try Swallowing - Swallowing forces the eustachian tube to open and forces your ears to pop.
• Chew gum.
• Give your baby a pacifier or bottle.

A heart attack (also called myocardial infarction) is when part of the heart muscle is damaged or dies because it isn’t receiving oxygen. Oxygen is carried to the heart by the arteries (blood vessels). Most heart attacks are caused by a blockage in these arteries. Usually the blockage is caused by atherosclerosis, which is the buildup of fatty deposits (called plaque) inside the artery. Click here for Signs Of a Heart Attack, Stroke and Cardiac Arrest

Risk factors for a heart attack

• Smoking
• Diabetes
• Increasing age–83% of people who die from heart disease are 65 years of age or older
• High cholesterol level
• High blood pressure
• Family history of heart attack
• Race–African Americans, Mexican Americans, Native Americans and Native Hawaiians are at greater risk.
• Atherosclerosis (hardening of the arteries)
• Lack of exercise
• Stress
• Obesity
• Sex–More males have heart attacks, although heart disease is the leading cause of death for American women.

Airplanes cabin pressurization is the active pumping of air into an aircraft cabin to increase the air pressure within the cabin. Planes are pressurized as cruising altitudes are freezing and lack sufficient oxygen to breathe inside.

During rare instances the aircraft may lose cabin pressurization at high altitude. Forcing the plane into a rapid descent to 10,000 ft after a sudden loss of pressure is a standard emergency procedure. 10,000 ft is an altitude that can be tolerated without supplemental oxygen.

Wherein there is a loos in cabin pressure, from a medical point of passengers are in the risk of lack of oxygen which is compensated by the oxygen masks.

To reduce the amount of expansion and contraction that the fuselage must endure (and reduce metal fatigue) the cabins are usually regulated for an equivalent of 8,000 ft of altitude.

Cabins are pressurized by an environmental control system (ECS) using air provided by compressors or bleed air. Some aircraft, such as the Boeing 787, use electric compressors to provide pressurization. Control systems maintain air pressure equivalent to 2,500 m (8,000 ft) or below, even during flight at altitudes above 13,000 m (43,000 ft).