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The description you have provided reflects a condition known as morning stiffness
which is a condition frequently seen in arthritis especially rheumatoid arthritis
. The patients joints is stiff and painful in morning but the symptoms relieve after sometime. It is recommended to visit an orthopedic doctor as she may require some investigations like RA factor and x-ray of the knee joints for evaluation.
On the counter drugs like diclofenic sodium and paracetamol
are very effective in such conditions.