Nasal congestion, often referred to as a stuffy nose, occurs when the tissues lining your nasal passages become inflamed and swollen. This inflammation can narrow the airways, making it difficult to breathe through your nose. Various factors can trigger nasal congestion.

The most common culprits are infections, such as the common cold or flu. These viruses irritate and inflame the nasal tissues, leading to congestion along with other symptoms like cough, sore throat, and runny nose. Another frequent cause is allergies. When exposed to allergens like pollen, dust mites, or pet dander, your immune system overreacts, causing inflammation and congestion.

Drug testing looks for the presence of various substances in a person's system. The specific types of drugs screened for can vary depending on the context of the test. However, some commonly tested drug categories include illegal substances like marijuana, cocaine, opiates (including heroin and oxycodone), phencyclidine (PCP), and methamphetamine. These drugs can significantly impair judgment, coordination, and reaction time, posing safety hazards in certain professions.

Additionally, many drug tests screen for prescription drugs or over-the-counter medications that can be misused or interact poorly with other substances. This might include testing for amphetamines, which can be present in ADHD medications, or benzodiazepines, found in anti-anxiety medications. The goal is to ensure employees aren't under the influence of substances that could compromise their ability to perform their jobs safely.