The normal human respiratory rate is 12-20 breaths per minute. A frequency of less than 12 breaths per minute is considered slow respiration and is most often the result of anesthetic or sedative overdose or increased intracranial pressure. A frequency greater than 20 breaths/minute is tachypnea, mostly seen in patients with fever, pain, anemia, hyperthyroidism or heart failure. Common respiratory symptoms are: 1. sigh-like breathing, manifested in a phase in which a loud breath is inserted in the normal respiratory rhythm, accompanied by a sigh. 2. inhibitory breathing: with severe chest pain, resulting in a sudden interruption of breathing and inhibition of respiratory movements. 3. tidal breathing: with irregular breathing in a cyclic manner, with a gradual increase or gradual decrease in respiratory frequency and depth of breathing, such that apnea alternates with each other Performance.