If one practices Goenka style Vipassana or Anapana meditation then the main object of contemplation is the nose area.
If one has a cold and the nose is blocked then is it o.k. to breath through the mouth, chest or abdomen(in the Goenka, Anapana or any Buddhist meditation that uses the nose area)?
If, in that situation, it is proper to breath through the mouth, then are there any special instructions for breathing through the mouth in Anapana, Goenka or any other Buddhist meditation practice that uses the nose area?
What if one has always found it difficult to breath through the nose because of a partial blockage or some unknown condition that might be psychological?