It is perfectly normal to feel very tight on both sides one week after a breast augmentation, especially if fairly large implants were placed in fairly small breasts (which would require a higher degree of stretching of the tissue), and if they are under the muscle.Time and massage, along with the muscle relaxers if needed, are the best remedies to soften the breasts and decrease the tight feeling.Also, a "numb" feeling in the arms and/or breasts is somewhat common and should get back to normal as time goes on.Be sure to discuss your concerns with your surgeon, but try not to worry at this point as you are very early out from the surgery. By 6 weeks you should see a great deal of improvement, but it could take as long as 6 months for the final result.Hang in there!