👉 Hydrarthrosis is a medical condition characterized by a thick, watery sputum that can be difficult to cough up. It's often caused by an inflammation of the trachea (windpipe) or larynx (voice box), which can also lead to difficulty breathing and other symptoms such as chest pain or shortness of breath. Treatment for hydrarthrosis typically involves antibiotics, supportive care, and possibly surgery if necessary.