diff --git a/clang-tools-extra/clangd/FormattedString.h b/clang-tools-extra/clangd/FormattedString.h
--- a/clang-tools-extra/clangd/FormattedString.h
+++ b/clang-tools-extra/clangd/FormattedString.h
@@ -51,6 +51,10 @@
   /// Append inline code, this translates to the ` block in markdown.
   Paragraph &appendCode(llvm::StringRef Code);
 
+  /// Ensure there is space between the surrounding chunks.
+  /// Has no effect at the beginning or end of a paragraph.
+  Paragraph &appendSpace();
+
 private:
   struct Chunk {
     enum {
@@ -60,6 +64,10 @@
     std::string Contents;
     /// Language for code block chunks. Ignored for other chunks.
     std::string Language;
+    // Whether this chunk should be surrounded by whitespace.
+    // Consecutive SpaceAfter and SpaceBefore will be collapsed into one space.
+    // Code spans don't set this: their spaces belong "inside" the span.
+    bool SpaceBefore = false, SpaceAfter = false;
   };
   std::vector<Chunk> Chunks;
 };
diff --git a/clang-tools-extra/clangd/FormattedString.cpp b/clang-tools-extra/clangd/FormattedString.cpp
--- a/clang-tools-extra/clangd/FormattedString.cpp
+++ b/clang-tools-extra/clangd/FormattedString.cpp
@@ -339,18 +339,21 @@
 }
 
 void Paragraph::renderMarkdown(llvm::raw_ostream &OS) const {
-  llvm::StringRef Sep = "";
+  bool NeedsSpace = false;
+  bool HasChunks = false;
   for (auto &C : Chunks) {
-    OS << Sep;
+    if (C.SpaceBefore || NeedsSpace)
+      OS << " ";
     switch (C.Kind) {
     case Chunk::PlainText:
-      OS << renderText(C.Contents, Sep.empty());
+      OS << renderText(C.Contents, !HasChunks);
       break;
     case Chunk::InlineCode:
       OS << renderInlineBlock(C.Contents);
       break;
     }
-    Sep = " ";
+    HasChunks = true;
+    NeedsSpace = C.SpaceAfter;
   }
   // Paragraphs are translated into markdown lines, not markdown paragraphs.
   // Therefore it only has a single linebreak afterwards.
@@ -359,10 +362,12 @@
 }
 
 void Paragraph::renderPlainText(llvm::raw_ostream &OS) const {
-  llvm::StringRef Sep = "";
+  bool NeedsSpace = false;
   for (auto &C : Chunks) {
-    OS << Sep << C.Contents;
-    Sep = " ";
+    if (C.SpaceBefore || NeedsSpace)
+      OS << " ";
+    OS << C.Contents;
+    NeedsSpace = C.SpaceAfter;
   }
   OS << '\n';
 }
@@ -385,6 +390,12 @@
   }
 }
 
+Paragraph &Paragraph::appendSpace() {
+  if (!Chunks.empty())
+    Chunks.back().SpaceAfter = true;
+  return *this;
+}
+
 Paragraph &Paragraph::appendText(llvm::StringRef Text) {
   std::string Norm = canonicalizeSpaces(Text);
   if (Norm.empty())
@@ -393,6 +404,8 @@
   Chunk &C = Chunks.back();
   C.Contents = std::move(Norm);
   C.Kind = Chunk::PlainText;
+  C.SpaceBefore = isWhitespace(Text.front());
+  C.SpaceAfter = isWhitespace(Text.back());
   return *this;
 }
 
diff --git a/clang-tools-extra/clangd/Hover.cpp b/clang-tools-extra/clangd/Hover.cpp
--- a/clang-tools-extra/clangd/Hover.cpp
+++ b/clang-tools-extra/clangd/Hover.cpp
@@ -772,7 +772,7 @@
   // https://github.com/microsoft/vscode/issues/88417 for details.
   markup::Paragraph &Header = Output.addHeading(3);
   if (Kind != index::SymbolKind::Unknown)
-    Header.appendText(index::getSymbolKindString(Kind));
+    Header.appendText(index::getSymbolKindString(Kind)).appendSpace();
   assert(!Name.empty() && "hover triggered on a nameless symbol");
   Header.appendCode(Name);
 
@@ -786,9 +786,9 @@
     // Parameters:
     // - `bool param1`
     // - `int param2 = 5`
-    Output.addParagraph().appendText("→").appendCode(*ReturnType);
+    Output.addParagraph().appendText("→ ").appendCode(*ReturnType);
     if (Parameters && !Parameters->empty()) {
-      Output.addParagraph().appendText("Parameters:");
+      Output.addParagraph().appendText("Parameters: ");
       markup::BulletList &L = Output.addBulletList();
       for (const auto &Param : *Parameters) {
         std::string Buffer;
@@ -803,7 +803,7 @@
 
   if (Value) {
     markup::Paragraph &P = Output.addParagraph();
-    P.appendText("Value =");
+    P.appendText("Value = ");
     P.appendCode(*Value);
   }
 
@@ -883,6 +883,7 @@
     }
   }
   Out.appendText(Line);
+  Out.appendSpace();
 }
 
 void parseDocumentation(llvm::StringRef Input, markup::Document &Output) {
diff --git a/clang-tools-extra/clangd/unittests/FormattedStringTests.cpp b/clang-tools-extra/clangd/unittests/FormattedStringTests.cpp
--- a/clang-tools-extra/clangd/unittests/FormattedStringTests.cpp
+++ b/clang-tools-extra/clangd/unittests/FormattedStringTests.cpp
@@ -155,11 +155,11 @@
   // Purpose is to check for separation between different chunks.
   Paragraph P;
 
-  P.appendText("after");
+  P.appendText("after ");
   EXPECT_EQ(P.asMarkdown(), "after");
   EXPECT_EQ(P.asPlainText(), "after");
 
-  P.appendCode("foobar");
+  P.appendCode("foobar").appendSpace();
   EXPECT_EQ(P.asMarkdown(), "after `foobar`");
   EXPECT_EQ(P.asPlainText(), "after foobar");
 
@@ -173,8 +173,16 @@
   Paragraph P;
   P.appendText("foo\n   \t   baz");
   P.appendCode(" bar\n");
-  EXPECT_EQ(P.asMarkdown(), "foo baz `bar`");
-  EXPECT_EQ(P.asPlainText(), "foo baz bar");
+  EXPECT_EQ(P.asMarkdown(), "foo baz`bar`");
+  EXPECT_EQ(P.asPlainText(), "foo bazbar");
+}
+
+TEST(Paragraph, SpacesCollapsed) {
+  Paragraph P;
+  P.appendText(" foo bar ");
+  P.appendText(" baz ");
+  EXPECT_EQ(P.asMarkdown(), "foo bar baz");
+  EXPECT_EQ(P.asPlainText(), "foo bar baz");
 }
 
 TEST(Paragraph, NewLines) {
diff --git a/clang-tools-extra/clangd/unittests/HoverTests.cpp b/clang-tools-extra/clangd/unittests/HoverTests.cpp
--- a/clang-tools-extra/clangd/unittests/HoverTests.cpp
+++ b/clang-tools-extra/clangd/unittests/HoverTests.cpp
@@ -2021,8 +2021,8 @@
                {
                    // FIXME: we insert spaces between code and text chunk.
                    "Tests primality of `p`.",
-                   "Tests primality of `p` .",
-                   "Tests primality of p .",
+                   "Tests primality of `p`.",
+                   "Tests primality of p.",
                },
                {
                    "'`' should not occur in `Code`",