A blood oxygen saturation of less than 95% is dangerous for hypoxia.
Blood oxygen saturation below 95% is often hypoxic, and diseases that cause hypoxia to occur commonly include pulmonary embolism and acute heart failure.
Pulmonary embolism disease causing oxygen saturation below 95% may lead to cardiac arrest. Acute heart failure causing oxygen saturation below 95% may lead to symptoms such as dyspnea and sedentary breathing.
In addition, congenital heart disease, chronic obstructive pulmonary disease, and asthma attacks can cause oxygen saturation levels to fall below 95%, leading to symptoms such as dyspnea and shortness of breath, which can affect both work and quality of life.
If you feel unwell, you should seek medical attention promptly.