This is called nasal irrigation.
Nasal lavage
Sinus lavage is the medical term meaning washing of nasal sinuses. Sinus lavage may be performed for therapeutic or diagnostic reasons.
Sinusitis
The medical term for washing the nasal sinuses is "nasal irrigation" or "nasal douche." It involves flushing out the sinuses with a saline solution to help alleviate congestion and improve breathing.
Displacement Therapy
The medical term for the washing of the nasal sinuses is "nasal irrigation" or "sinus irrigation." This procedure involves flushing the nasal passages and sinuses with a saline solution to help alleviate symptoms of sinus congestion, allergies, and infections. It can be performed using various devices, such as a neti pot or saline squeeze bottle.
The term for bloody nasal discharge would depend on what the fluid is that is coming out. If you are referring to just blood coming out then the term is epistaxis.
Rhinitis is the medical term meaning inflammation of the nasal mucosa. Causes can include allergies, irritants, or infection.
Rhinitis is inflammation of the nasal mucous membranes.
lavage
Rhinitis is inflammation of the nasal lining.
Nasal polyposis, or nasal polyps, is overgrowth of nasal mucosal tissue. Hypertrophy of the turbinates is another kind of overgrowth of nasal mucosal tissue. Rhinophyma is overgrowth of the external nose.