Cluster headache, the most common form of trigeminal autonomic cephalgia, is a rare primary headache disorder that affects less than 1% of the population. The mean age of onset is 30 years, and it is two to three times more common in males. Cluster headache consists of attacks of severe unilateral pain located in the orbital, supraorbital, and/or temporal region that occur from every other day up…

Fever of unknown origin is defined as a clinically documented temperature of 101°F or higher on several occasions, coupled with an unrevealing diagnostic workup. The differential diagnosis is broad but is typically categorized as infection, malignancy, noninfectious inflammatory disease, or miscellaneous. Most cases in adults occur because of uncommon presentations of common diseases, and up to…

Familiarity with common oral conditions allows clinicians to observe and treat patients in the primary care setting or refer to a dentist, oral surgeon, otolaryngologist, or other specialist. Recurrent aphthous stomatitis (canker sores) is the most common ulcerative condition of the oral cavity. Recurrent herpes simplex labialis and stomatitis also commonly cause oral ulcers. Corticosteroids,…

Primary care clinicians are uniquely situated to reduce unintended pregnancy in the context of a patient’s medical comorbidities, social circumstance, and gender identity. New evidence regarding contraception use has emerged in recent years. The copper intrauterine device is the most effective option for emergency contraception, with similar effectiveness found for the levonorgestrel-releasing…

Upper respiratory tract infections are responsible for millions of physician visits in the United States annually. Although viruses cause most acute upper respiratory tract infections, studies show that many infections are unnecessarily treated with antibiotics. Because inappropriate antibiotic use results in adverse events, contributes to antibiotic resistance, and adds unnecessary costs, family…

Comprehensive urinalysis involves inspection of the urine, dipstick chemical analysis, and microscopy and can be performed in the office setting. When testing for urinary tract infection, midstream urine should be collected using the clean-catch technique. A urine collection bag specimen can be used for clinically stable febrile infants with suspected urinary tract infection; however, the…