Pursed lips are lips pressed together and pushed slightly outward, creating a small, tight opening. The expression looks similar to the shape your mouth makes when you whistle or blow out a candle. Pursed lips show up in three very different contexts: as a body language signal, as a deliberate breathing technique for lung conditions, and occasionally as an involuntary movement tied to neurological issues.
The Muscle Behind the Movement
The orbicularis oris, a circular muscle that rings the entire mouth opening, is responsible for pursing. It pulls the lips inward from all directions and can tighten or relax to control how narrow the opening becomes. This muscle is controlled by two branches of the facial nerve, which is why damage to that nerve (from a stroke or Bell’s palsy, for example) can make it difficult or impossible to purse the lips on one side of the face. The orbicularis oris is sometimes called the “kissing muscle” because it controls puckering, but it also plays a role every time you speak, drink through a straw, or hold air in your cheeks.
Pursed Lips as Body Language
In everyday conversation, pursing the lips is one of the more reliable facial cues for tension or restraint. The gesture typically signals that someone is holding back words, whether out of disapproval, frustration, or careful deliberation. It’s the face of someone biting their tongue.
Pursed lips differ from a simple frown or tight jaw. The lips pull inward from all sides and push forward slightly, creating a concentrated, almost pointed shape. You might see this expression on someone weighing a difficult decision, someone who disagrees but isn’t ready to say so, or someone suppressing anger. It often appears briefly as a micro-expression, lasting only a fraction of a second before the person’s face returns to neutral. Context matters: a person pursing their lips while listening to a sales pitch is likely skeptical, while the same expression during a chess game probably signals deep concentration.
Pursed Lip Breathing as a Technique
Pursed lip breathing (PLB) is a simple, widely taught method for managing shortness of breath. It works by creating a small amount of back-pressure in the airways when you exhale through a narrow lip opening. That pressure keeps the smallest airways from collapsing shut, which is a common problem in conditions like COPD and emphysema where the airways have lost their natural structure and stiffness.
The technique is straightforward: breathe in slowly through your nose for about two counts, then exhale through pursed lips for about four counts, as if you’re gently blowing on hot soup. The exhale should take roughly twice as long as the inhale. The key is keeping the exhale slow and controlled rather than forceful.
PLB is used across a range of respiratory conditions, including COPD, asthma, and congestive heart failure. It also helps during panic attacks by slowing the breathing rate and activating the body’s calming response. Research on COPD patients found that a single session of pursed lip breathing raised blood oxygen levels by about 2 percentage points on average, moving participants from roughly 92% to 94% oxygen saturation. That may sound small, but for someone whose oxygen levels are already borderline low, that improvement can mean the difference between comfort and distress.
How PLB Helps During Activity
One of the most practical uses of pursed lip breathing is during physical exertion. People with chronic lung disease often avoid exercise because they feel too short of breath, which leads to deconditioning and even worse breathlessness over time. PLB breaks that cycle. By using the technique during walking, stair climbing, or pulmonary rehabilitation exercises, you can reduce the feeling of air hunger enough to stay active longer. Many people learn to exhale through pursed lips on the effort portion of any movement (lifting, standing up, climbing) and inhale during the rest phase.
When Pursed Lips Are a Warning Sign
In people already diagnosed with COPD, healthcare providers watch for increased, involuntary pursed lip breathing as a sign of worsening respiratory distress. The body essentially adopts the technique on its own as the airways struggle to stay open. If someone with COPD starts pursing their lips more frequently, especially alongside heavier use of neck and shoulder muscles to breathe, it may indicate approaching respiratory failure.
This is different from using PLB as a deliberate exercise. The concern is when it becomes constant and unconscious, a sign the lungs are working much harder than usual to move air.
Involuntary Lip Pursing and Neurological Conditions
Repetitive, involuntary lip movements, including pursing, smacking, and puckering, can be a symptom of tardive dyskinesia. This condition involves uncontrollable, repetitive movements that typically start in the face and mouth. It most often develops as a side effect of long-term use of certain psychiatric medications, particularly older antipsychotics. The classic presentation includes lip smacking, tongue protrusion, cheek puffing, and rhythmic jaw movements.
A related condition, tardive dystonia, involves sustained muscle contractions that can force the lips or jaw into abnormal postures. It tends to affect younger patients. In older adults, similar involuntary mouth movements sometimes appear without any history of medication use, often linked to age-related dental problems or other medical conditions. The distinction between a deliberate habit and an involuntary movement disorder is usually clear: involuntary pursing is repetitive, rhythmic, and difficult or impossible to stop on command.