Sinus paranasales is a Latin term that refers to the air-filled cavities in the skull bones. These cavities are important as they help to lighten the skull and resonate sound during speech. There are several synonyms for sinus paranasales including nasal sinuses, paranasal sinuses, and air sinuses. The nasal sinuses are subdivided into maxillary, frontal, sphenoidal, and ethmoidal sinuses. Paranasal sinuses are not only important for anatomical balance but also for their critical role in nasal breathing and olfaction. When inflammation occurs, sinusitis may lead to pain, congestion, headache, and difficulty breathing. It is essential to seek medical attention in case of sinusitis as it may be a symptom of an underlying condition.