You should see a speech therapist any time a speech, language, voice, or swallowing problem starts interfering with daily life, whether that’s a toddler not hitting word milestones, a child who stutters with visible tension, an adult whose voice has been hoarse for more than four weeks, or someone who chokes or coughs regularly while eating. The threshold isn’t perfection. It’s function: can you or your child communicate and eat comfortably enough to get through the day?
Below are the most common situations that call for an evaluation, broken down by age and type of concern.
Children: Speech and Language Milestones
Most parents first wonder about a speech therapist because their child isn’t talking as much or as clearly as other kids the same age. The clearest way to gauge this is against established milestones from the National Institutes of Health.
By their first birthday, children typically have one or two recognizable words like “mama,” “dada,” or “hi.” They babble in long and short strings of sounds and imitate speech they hear around them. Between ages 1 and 2, new words should appear regularly, and your child should start combining two words together (“more cookie,” “where kitty?”). By age 2 to 3, children have a word for almost everything, use two- or three-word phrases, and speak clearly enough that family members and close friends can understand them.
Between 3 and 4, sentences stretch to four or more words, and speech flows without noticeable repetition of syllables. By age 4 to 5, children tell stories that stay on topic, give detailed sentences, and pronounce most sounds correctly. A handful of trickier sounds (l, s, r, v, z, ch, sh, th) may still be developing at this age, and that’s normal.
If your child is consistently behind these benchmarks by six months or more, that’s a strong signal to schedule an evaluation. The same goes for a child who was meeting milestones and then loses words or stops talking as much as they used to.
Stuttering: Normal Phase vs. Lasting Problem
Nearly all young children go through a period of stumbling over words. They repeat whole words, use filler sounds like “uh,” or restart sentences. These typical disfluencies are part of learning to talk and usually resolve on their own.
A stuttering disorder looks different. The specific signs include repeating parts of words or individual sounds (“b-b-boy”), stretching sounds out longer than normal (“sssssometimes”), silent blocks where the child appears stuck and can’t get a sound out, and visible physical tension or struggle in the face, jaw, or neck while trying to speak. The frequency of these behaviors can shift from day to day and from one situation to the next, which sometimes makes parents second-guess what they’re seeing.
If you notice these patterns persisting for several months, or if your child starts avoiding speaking situations, pulling back from conversations, or expressing frustration about talking, an evaluation with a speech therapist is worthwhile. Early intervention for stuttering has a strong track record, especially before school age when social pressure around speaking ramps up.
Social Communication Difficulties
Some children speak in full sentences with clear pronunciation but still struggle to communicate effectively. The issue isn’t the words themselves. It’s how they use language in social situations.
Red flags include taking language too literally (missing sarcasm, jokes, or figures of speech), difficulty reading facial expressions and body language, trouble maintaining a back-and-forth conversation, unusual eye contact, and not adjusting their tone or word choice based on who they’re speaking to. These challenges often become more visible once a child enters school, where social expectations jump sharply. Children may seem rude or disinterested when they’re actually missing the unspoken rules of conversation.
Speech therapists who specialize in pragmatic language (the social side of communication) work on skills like understanding humor, interpreting nonverbal cues, and staying on topic during conversation. If your child’s teachers or peers consistently misread their intentions, or if your child seems confused by social interactions that come easily to classmates, a pragmatic language evaluation can clarify what’s going on.
Feeding and Swallowing Problems in Children
Speech therapists also treat feeding disorders, which makes sense once you consider that the mouth, tongue, and throat muscles used for speaking are the same ones used for eating. In young children, signs that point toward a feeding evaluation include gagging before food reaches the mouth (anticipatory gagging), coughing or choking during meals, refusing entire categories of texture, accepting only a very narrow range of foods, and actively avoiding or fighting the feeding process.
More serious red flags include breathing difficulty during feeding, recurrent respiratory infections that could signal food or liquid entering the airway, and poor weight gain. Feeding therapy typically involves gradually expanding food tolerance, building oral motor skills, and reducing the anxiety that often surrounds mealtimes for these children.
Voice Changes That Last More Than Four Weeks
Hoarseness after cheering at a game or fighting off a cold is normal and temporary. But when a raspy, breathy, or strained voice persists, it needs attention. Current clinical guidelines recommend that any voice change lasting more than four weeks should prompt a referral for a direct look at the vocal cords. Older guidelines used to set that window at three months, but the threshold was shortened because waiting too long can delay the diagnosis of conditions that benefit from early treatment.
A speech therapist who specializes in voice disorders works alongside an ear, nose, and throat physician. The doctor examines the vocal cord structure; the therapist addresses how you’re using your voice. Treatment often involves changing vocal habits, breathing techniques, and hydration strategies rather than surgery. If your voice hasn’t bounced back within a month, or if you also notice pain while speaking, difficulty projecting, or a feeling of strain that wasn’t there before, get it checked.
Swallowing Difficulty in Adults
Difficulty swallowing, known as dysphagia, can develop after a stroke, with neurological conditions, after surgery to the head or neck, or sometimes without an obvious trigger. Common symptoms include pain while swallowing, feeling like food is stuck in the throat or chest, food or liquid coming back up, coughing or gagging during meals, drooling, and unexplained weight loss.
The concern isn’t just discomfort. When food or liquid slips into the airway instead of the esophagus, it can cause aspiration pneumonia, a serious lung infection. If you regularly have trouble swallowing, or if you’ve started avoiding certain foods or cutting things into unusually small pieces to get them down, a swallowing evaluation can determine what’s happening and whether exercises, diet modifications, or posture changes during meals can help.
Speech and Language After Stroke or Brain Injury
Stroke is one of the most common reasons adults suddenly lose the ability to speak, understand language, or both. This condition, called aphasia, varies widely in severity. Some people lose only their ability to find specific words; others can’t produce or comprehend speech at all.
Recovery follows a predictable curve. Most gains happen in the first year, with the steepest improvement occurring in the earliest weeks and months. The brain’s surviving regions gradually reorganize to take over language functions, a process that unfolds over weeks to months rather than days. This means starting therapy promptly matters, not because a specific number of therapy hours predicts recovery (research from a large longitudinal study published in Brain found it did not), but because early, structured practice gives the brain the input it needs while it’s reorganizing most actively.
If you or a family member experiences sudden difficulty speaking, understanding speech, reading, or writing, a speech therapy evaluation should be part of the recovery plan from the start.
What Happens During an Evaluation
A speech-language evaluation is a conversation and a series of structured tasks, not a single pass-fail test. It typically starts with a detailed case history covering medical background, education, and cultural and linguistic context. The therapist interviews the person being evaluated (and family members, when relevant), then reviews hearing, vision, motor, and cognitive status to rule out factors that could affect communication.
From there, the evaluation moves into standardized and informal measures targeting the specific area of concern, whether that’s articulation, language comprehension, fluency, voice, social communication, or swallowing. For children, this often involves play-based activities designed to draw out natural speech. For adults, it might include picture naming, sentence repetition, reading passages aloud, or a trial swallow with different food textures.
The evaluation ends with a clear picture of strengths and weaknesses, and, if therapy is recommended, a plan tailored to the specific patterns the therapist observed. Most evaluations run between 60 and 90 minutes, though complex cases can take longer or require a follow-up session.